Free tools
Free online tools that run in your browser
327 tools for sound, writing, time and money, photos and PDFs, SEO files, daily practice and quick conversions. They run in your browser: these pages don't upload your files, there is nothing to install and no account to make.
Start here
The tools people open most.
- Online mic testSee your mic level and waveform live, then play back a clip.Open tool
- Push notification testerBuild and validate an APNs payload against the 4 KB limit.Open tool
- JPG to PDFTurn photos and scans into one PDF, on your own device.Open tool
- Rahu Kaal todayRahu Kaal, Yamaganda, Gulika and Abhijit for your city.Open tool
Audio & music
Test mics and speakers, measure noise, play tones and chords, cut and join audio, tune and keep time.
- Online mic testSee your mic level and waveform live, then play back a clip.
Mic to SpeakerOpen - Speaker testSpoken left/right check, an out-of-phase test, tones and a 20 Hz to 20 kHz sweep.Mic to SpeakerOpen
- Decibel meterA live sound level estimate from your microphone.Mic to SpeakerOpen
- Hearing frequency testThe highest tone you can hear, with headphones.Mic to SpeakerOpen
- Tone generatorSine, square or saw at any frequency, with a sweep.Mic to SpeakerOpen
- White, pink and brown noiseSteady noise for sleep or focus, with a sleep timer.
- Clean phone speakersA 165 Hz tone or low sweep to push water out of a speaker.Mic to SpeakerOpen
- Online voice recorderRecord from any mic, pause, play back and download.Mic to SpeakerOpen
- MP3 cutterTrim a song or clip, add fades, save as MP3.
- Audio joinerJoin MP3, M4A and WAV files into one track.
- Voice changerDeep, chipmunk, robot and echo voices, saved as audio.Mic to SpeakerOpen
- M4A to MP3Convert M4A, AAC, WAV or OGG files to MP3.Mic to SpeakerOpen
- Video to MP3Save the soundtrack of a video as an MP3.
- Online guitar tunerTune guitar, bass or ukulele with your microphone.
Guitar Tuner: ChromaticOpen - Guitar chord chartFinger positions for common chords, with sound.Guitar Tuner: ChromaticOpen
- Piano chords and scalesChords and scales lit on a keyboard, with sound.
Drums n PianoOpen - Vocal range testThe note you sing, and your lowest and highest notes.Guitar Tuner: ChromaticOpen
- Online tanpuraA tanpura drone in any key, for singing practice.Drums n PianoOpen
- Online metronomeSteady click from 20 to 300 BPM with tap tempo and accents.Guitar Tuner: ChromaticOpen
- Virtual pianoPlay 25 keys with your keyboard, mouse or touch.Drums n PianoOpen
- Online drum machineProgram a 16-step beat from rock, hip-hop or house presets.Drums n PianoOpen
Video tools
Record your webcam, trim, compress and convert videos to MP4, GIF or MP3.
- Trim videoCut the start and end of a clip and save it.
- Video compressorShrink a clip for WhatsApp, email or upload.
- MOV to MP4iPhone MOV clips to MP4, with the video copied when it can be.
- Video to GIFA few seconds of video as a looping GIF.
- Video to MP3Save the soundtrack of a video as an MP3.
- Webcam recorderRecord yourself with camera and mic, then save it.
- Screen recorderRecord a screen, window or tab with your mic.
iOS developer & learning
JSON, JWT, regex, privacy manifests, payloads, screen sizes and ad maths.
- JSON formatterPretty print, minify, validate and browse a tree.
- JSON diffCompare two JSON files by meaning, with paths, a side-by-side view and a JSON Patch.
- JSON to Swift CodablePaste JSON, get Codable structs with CodingKeys.
Catalog - UIOpen - JSON to TypeScript and KotlinTypeScript and Kotlin types from a sample JSON.Catalog - UIOpen
- Base64Encode and decode text or files, URL-safe too.
- JWT decoderHeader, claims and expiry, with signature check.
Push Notification - TesterOpen - JWT generatorCreate and sign JWTs with HS, RS, PS, ES or EdDSA keys in your browser.
- UUID generatorVersion 4 and 7 UUIDs, one or a thousand.
- Regex testerLive matches, groups and a replace preview.
- HTTP status codesEvery HTTP status code with causes, fixes, retry and caching notes.
- curl to code converterTurn a curl command into Python, JavaScript, Swift, Kotlin, Go and more, or build one from a form.
- Lorem ipsumPlaceholder paragraphs, sentences, words or lists.
- Privacy manifest generatorPrivacyInfo.xcprivacy with required-reason APIs.Catalog - UIOpen
- App Store screenshot sizesEvery screenshot size, and a checker for your image files.Catalog - UIOpen
- App Store character counterCount name, subtitle, keywords and description limits.
- Bundle ID lookupFind any App Store app's bundle ID, App Store ID and push topics.
- App icon generatorOne image or a made-here icon to iOS, macOS, watchOS, Android and PWA icon sets.Catalog - UIOpen
- Favicon generatorfavicon.ico, SVG favicon with dark mode, touch icon and web manifest in one ZIP.
- iPhone screen sizesPoints, pixels, scale and PPI for every iPhone in use.Catalog - UIOpen
- Apple device screen sizesPoints, pixels, PPI and safe areas for every iPhone, iPad and Watch, plus a free JSON API.
- app-ads.txtBuild seller lines and check a file line by line.
AdEarnings ProOpen - eCPM calculatorSolve for earnings, impressions or eCPM, plus CTR and ARPDAU.AdEarnings ProOpen
- Push notification testerBuild and validate an APNs payload against the 4 KB limit.Push Notification - TesterOpen
- Push notification previewWhere a push title and body get cut off.Push Notification - TesterOpen
- AHAP editorDraw a Core Haptics pattern and export .ahap.
Haptics ExplorerOpen - Vibration testTest the vibration motor with preset and custom patterns.Haptics ExplorerOpen
- Phone testCheck screen, touch, speakers, mic and cameras before a sale.Mic to SpeakerOpen
- AASA validatorCheck an apple-app-site-association file and test URLs.
- .mobileprovision viewerRead a provisioning profile's devices, expiry and entitlements.Push Notification - TesterOpen
- Sorting algorithm visualizerWatch six sorting algorithms step through the same data.
DSA MasterOpen - Data structures and algorithmsWhat each structure and algorithm is, and what it costs.DSA MasterOpen
- assetlinks.json validatorGenerate and check Android App Links files, then ask Google what it sees.
- Deep link testeradb, intent:// and Simulator commands for any link, plus an intent-filter check.
- Keystore and APK fingerprintSHA-1, SHA-256 and key hash from a .jks, .p12, APK or certificate.
- Android adaptive icon generatorAdaptive, round, themed and Play Store icons with a safe-zone overlay.
- Connection string builderBuild or fix PostgreSQL, MySQL, MongoDB, SQL Server and Redis connection strings.
Android developer tools
App Links, signing fingerprints, deep links and adaptive icons.
- assetlinks.json validatorGenerate and check Android App Links files, then ask Google what it sees.
- Deep link testeradb, intent:// and Simulator commands for any link, plus an intent-filter check.
- Keystore and APK fingerprintSHA-1, SHA-256 and key hash from a .jks, .p12, APK or certificate.
- Android adaptive icon generatorAdaptive, round, themed and Play Store icons with a safe-zone overlay.
Code and data
JSON, CSV and Excel, hashes and encoders, SQL, Markdown, cron and CSS helpers.
- JSON formatterPretty print, minify, validate and browse a tree.
- JSON diffCompare two JSON files by meaning, with paths, a side-by-side view and a JSON Patch.
- JSON to CSVJSON arrays to CSV and back.
- CSV viewer and editorOpen a CSV as a table to sort, filter and edit.
- CSV to ExcelCSV to .xlsx and Excel to CSV.
- VCF to CSVPhone contacts from .vcf to CSV, and back.
- Unzip filesOpen ZIP, RAR and 7z archives in the tab.
- JSON to TypeScript and KotlinTypeScript and Kotlin types from a sample JSON.Catalog - UIOpen
- JSON to Swift CodablePaste JSON, get Codable structs with CodingKeys.Catalog - UIOpen
- Base64Encode and decode text or files, URL-safe too.
- URL encode and decodePercent-encoding for links and query strings, both directions.
- Hash generatorMD5, SHA-1, SHA-256, SHA-384 and SHA-512 of text or a file, plus HMAC.
- JWT decoderHeader, claims and expiry, with signature check.Push Notification - TesterOpen
- JWT generatorCreate and sign JWTs with HS, RS, PS, ES or EdDSA keys in your browser.
- UUID generatorVersion 4 and 7 UUIDs, one or a thousand.
- Number base converterBinary, octal, decimal, hex and any base from 2 to 36, both ways.
- Binary translatorText to binary, hex and decimal, and back.
- Code beautifierFormat or minify HTML, CSS and JavaScript.
- SQL formatterIndent and tidy SQL for the database you use.
- Connection string builderBuild or fix PostgreSQL, MySQL, MongoDB, SQL Server and Redis connection strings.
- Markdown editorWrite Markdown with a live preview and HTML.
- Regex testerLive matches, groups and a replace preview.
- Cron expression explainerCron in plain English, with the next run times.
- Lorem ipsumPlaceholder paragraphs, sentences, words or lists.
- CSS gradient generatorLinear, radial and conic gradients with the CSS.
- PX to REMpx, rem, em and pt for any root font size.
- Favicon generatorfavicon.ico, SVG favicon with dark mode, touch icon and web manifest in one ZIP.
- Subnet calculatorCIDR, mask, host range and host count for IPv4 and IPv6.
- HTTP status codesEvery HTTP status code with causes, fixes, retry and caching notes.
- curl to code converterTurn a curl command into Python, JavaScript, Swift, Kotlin, Go and more, or build one from a form.
Image tools
Remove backgrounds, upscale, blur, watermark, make collages, split photos and make GIFs.
- Background removerCut out the subject and save a transparent PNG.
- Upscale imageEnlarge a photo 2x or 4x with an AI model on your device.
- Crop and rotate imageFree or 1:1, 4:5, 16:9 crops, rotate and flip.
- Blur or pixelate imageHide faces, plates and addresses before you share.
- Watermark photosText or logo watermarks on many photos at once.
- Image compressorShrink many images to a target size, as a ZIP.
Scan Via CamOpen - PNG to JPGTurn PNGs into JPGs in bulk, with your background colour.Scan Via CamOpen
- Change image DPISet 72, 150, 300 or any DPI. PNG, JPG and WebP keep every pixel.
- Strip image EXIFSee GPS and camera data, then strip it losslessly.Scan Via CamOpen
- Photo collage maker2 to 9 photos in a grid, with spacing and borders.
Wallpapers HD: Exotic 4KOpen - Image splitterCut a photo into a 3x3 grid or carousel slices.
Hashtags CreatorOpen - GIF makerPhotos into an animated GIF, with speed and loop.
- Screenshot beautifierPadding, backgrounds, round corners and a frame.
- SVG to PNGRender an SVG at any size as a sharp PNG.
- Passport photo makerPassport and visa sizes, plus a 4x6 print sheet.Scan Via CamOpen
- Wallpaper resizerCrop any photo to an exact phone, tablet or desktop size.Wallpapers HD: Exotic 4KOpen
- Image color pickerHEX and RGB from any pixel, plus the main colours.
- Color palette generatorLock, shuffle and export colour palettes as CSS.
- Color converterHex, RGB and HSL for the same color.
- Contrast checkerWCAG contrast for body text and large text.
- Image to textCopy text out of a photo or screenshot.Scan Via CamOpen
Faith & daily practice
Prayer times, Qibla, Quran, tasbih and zakat, panchang and the Gita, Bible reading and search.
- Rahu Kaal todayRahu Kaal, Yamaganda, Gulika and Abhijit for your city.
Mandir DarshanOpen - Choghadiya todayAll sixteen day and night periods from local sunrise.Mandir DarshanOpen
- Jaap mala counterTap to count mantras, 108 beads per mala, with a daily goal.
Hanuman Chalisa : OfflineOpen - Bible reading planA day-by-day chapter plan for 30 days to 2 years.
Bible Study AIOpen - World English BibleRead the public-domain Bible by chapter.Bible Study AIOpen
- Hanuman ChalisaThe Chalisa verse by verse, with Roman-letter lines.Hanuman Chalisa : OfflineOpen
- TemplesPlace, deity and aarti times for each temple.Mandir DarshanOpen
- Prayer timesFajr to Isha for your city, by calculation method.
- Qibla directionThe bearing to the Kaaba, with a phone compass.
- Hijri date converterUmm al-Qura Hijri and Gregorian dates, both ways.
- Today's panchangTithi, nakshatra, yoga and karana with end times.Mandir DarshanOpen
- Zakat calculatorZakat on cash, gold, silver and shares.
- Tasbih counter33, 99 or 100 counts, with a daily streak.
- Quran by surahThe Arabic text by surah and ayah.
- Bhagavad GitaSanskrit verses with an English translation.Mandir DarshanOpen
- Bible searchFind words and phrases in the World English Bible.Bible Study AIOpen
Converters & calculators
Currency, units, kitchen, shoe, ring and clothing sizes, land area, pixels, a ruler and pill supply.
- Currency converterECB rates for USD, EUR, GBP, INR and more, one page per pair.
Currency Converter : FastOpen - Units converterCommon conversions with the factor and a worked example.
Units Converter & CalculatorOpen - Cups to gramsCups and spoons to grams for 27 baking ingredients.Units Converter & CalculatorOpen
- Shoe size converterUS, UK and EU sizes for men, women and kids.Units Converter & CalculatorOpen
- Days supply calculatorWhen your pills run out and when to request a refill.
Daily Pills | ReminderOpen - Ring size converterUS, UK, EU, India and Japan sizes from a ring or finger.Units Converter & CalculatorOpen
- Land area converterBigha, katha, marla, kanal, gaj and acre by region.Units Converter & CalculatorOpen
- Online rulerA ruler at real size after a card calibration.
- Clothing size converterUS, UK, EU and Asian sizes for women, men and kids.
- Pixels to cmPixels to cm and inches at any DPI, and back.
Games
Sudoku, minesweeper, solitaire, marble and dot puzzles, word helpers, Secret Santa, bingo and brackets.
- Tic Tac ToeTwo players on one screen, right in the browser.
Tic Tac Toe : Time PassOpen - SudokuFour levels, notes, hints and a solver.
- Word unscramblerEvery word you can make from your letters.
- Five-letter word finderGreen, yellow and grey letters in, matching words out.
- MinesweeperThree board sizes, with flags, keyboard and touch.
- SolitaireKlondike with one or three card draw.
- Marble matchTap groups of matching marbles before time runs out.
- Dot connectJoin same-colour dots into chains.
- Secret Santa generatorA fair draw that keeps chosen people apart.
- Bingo card generatorPrintable bingo cards and a number caller.
- Tournament bracket makerKnockout or round-robin draws, filled in as you play.
Push notifications
APNs and FCM testers, JWT and token checks, error codes and a lock screen preview.
- Push notification testerBuild and validate an APNs payload against the 4 KB limit.Push Notification - TesterOpen
- Push notification previewWhere a push title and body get cut off.Push Notification - TesterOpen
- APNs JWT generatorSign an ES256 provider token from your .p8 key in the tab.Push Notification - TesterOpen
- APNs device token checkerCheck a token's hex format and length, and fix common mix-ups.Push Notification - TesterOpen
- Bundle ID lookupFind any App Store app's bundle ID, App Store ID and push topics.
- APNs error codesEvery APNs reason explained, with a fix checklist.Push Notification - TesterOpen
- Live Activity push payloadStart, update or end a Live Activity with the right headers.Push Notification - TesterOpen
Everyday utilities
Writing, voice typing, time, money, home, numbers and charts.
- Word counterWords, characters, sentences and reading time.
- Case converterUppercase, title case, camelCase and snake_case.
- Clean textTrim lines and collapse extra spaces.
- Find and replaceReplace a phrase and see how many changed.
- Sort linesSort A to Z, reverse, or as numbers, and drop duplicates.
- Compare two textsSee which lines differ, side by side.
- Password generatorA random password from your browser's crypto generator.
- List randomizerPick a winner, shuffle a list, or split teams.
- Age calculatorYears, months, days and the next birthday.
- Date calculatorDays between two dates, or add days, weeks and months.
- Business daysWeekdays between two dates. Weekends are skipped.
- Time zone converterWhat time a meeting is in another zone.
- Unix timestampTurn seconds or milliseconds into a date, and back.
- CountdownCount down hours, minutes and seconds.
- StopwatchStart, pause and record laps.
- Pomodoro timerFocus blocks, short breaks and a longer break.
- Tip calculatorTip, total and the share for each person.
- Split a billDivide a bill, with an optional tip.
- Discount calculatorSale price and how much you save.
- Percentage calculatorA percent of a number, or the change between two numbers.
- Sales tax calculatorAdd or remove GST, VAT or a sales-tax rate.
- Loan paymentEMI, total interest, prepayment savings and a year-by-year schedule.
- Compound interestLump sum, SIP and step-up growth, goal planning and inflation.
- Salary converterHourly, weekly, monthly and annual pay.
- Image compressorShrink many images to a target size, as a ZIP.Scan Via CamOpen
- PNG to JPGTurn PNGs into JPGs in bulk, with your background colour.Scan Via CamOpen
- Strip image EXIFSee GPS and camera data, then strip it losslessly.Scan Via CamOpen
- QR code generatorMake a QR code for a link or a short note.
- QR code readerRead a QR code from the camera or a picture.
- Color converterHex, RGB and HSL for the same color.
- Contrast checkerWCAG contrast for body text and large text.
- Aspect ratioSimplify a ratio and resize one side.
- BMI calculatorBody mass index from height and weight.
- Calorie needsBMR and a daily estimate from activity.
- Water intakeA daily water amount from body weight.
- Due date40 weeks from the first day of the last period.
- Running pacePace per kilometre and per mile from a distance and a time.
- Recipe scalerScale ingredient amounts to a new number of servings.Units Converter & CalculatorOpen
- Fuel costLitres and cost for a trip from distance and fuel use.
- Electricity costSeveral appliances, presets, monthly and yearly cost.
- Paint calculatorWall area and litres for a rectangular room.
- Sleep cyclesBedtimes that land on 90-minute cycles before you wake.
- GPA calculator4.0 GPA (weighted or not) or 10-point SGPA/CGPA, cumulative and percentage.
- Final gradeThe percent you need on the final to hit a target.
- Fraction calculatorAdd, subtract, multiply and divide fractions.
- Ratio calculatorSolve a proportion or simplify a ratio.
- Roman numeralsConvert between numbers and Roman numerals.
- Number to wordsSpell a number in English or Hindi, with lakh and crore or cheque wording.
- Dice rollerRoll 2d6+3, d20 or 4d6kh3, with advantage and history.
- Unit priceWhich pack is cheaper per unit.Units Converter & CalculatorOpen
- Time calculatorAdd hours and minutes, or the time between two clocks.
- Printable calendarAny month or year, ready to print or save as PDF.
- Moon phaseTonight's moon, illumination, rise and set times.
- Mortgage calculatorMonthly payment with tax, insurance, PMI and HOA.
- Profit marginMargin, markup and selling price from your cost.
- YouTube earningsDaily, monthly and yearly earnings from views and RPM.AdEarnings ProOpen
- Income tax (India)New and old regime side by side for this year.
- HRA exemptionExempt and taxable HRA from salary and rent.
- 13th month payPhilippine 13th month pay and the tax-free part.
- Ovulation calculatorFertile window and ovulation day for the next cycles.
- Period calculatorYour next periods from your cycle length.
- Concrete calculatorVolume, bags, cement, sand and aggregate.
- Square feet calculatorArea of rooms and shapes in sq ft, sq m and more.
- Scientific calculatorTrig, logs, powers, memory and history.Units Converter & CalculatorOpen
- Random number generatorOne number or many, with or without repeats.
- Coin flipHeads or tails, with counts and streaks.
- Text to speechRead text aloud with your device's voices.
- Online notepadNotes saved in this browser, with export.
- Morse code translatorText and Morse both ways, with sound and an on-page lamp.
- Barcode generatorEAN-13, UPC-A and Code 128 as PNG or SVG.
- Password strength checkerEstimated crack time, checked in the tab.
- Cement, sand and aggregateBags of cement, sand and aggregate for a mix.
- Tile calculatorTiles and boxes for a floor or wall, with waste.
- AC size calculatorAC tons or BTU for a room.
- Inverter battery backupHours of backup from battery size and load.
- Solar panel calculatorPanels and kW for the units you use each month.
- Timesheet calculatorWeekly hours with breaks and overtime.
- Week numberThe ISO week number of today or any date.
- Nepali date converterBikram Sambat and AD dates, both ways.
- Voice typingDictate into a text box with your voice.
- Rhyme finderRhymes and near rhymes, grouped by syllables.
- Tally counterSeveral counters with buttons or the keyboard.
- Chart makerBar, line and pie charts saved as PNG.
- Trip expense splitterWho paid what, and the fewest payments to settle.
- Interval timerHIIT and Tabata rounds with beeps.
Money and tax
Returns and growth, loans, salary and tax for India, the UK and the Philippines, and bank checks.
- Compound interestLump sum, SIP and step-up growth, goal planning and inflation.
- Simple interestInterest and total for any rate and period.
- CAGR calculatorThe yearly growth rate between two values.
- ROI calculatorReturn, net gain and annualised ROI.
- Stock average calculatorYour average price after buying more shares.
- Retirement calculatorThe corpus you need and the monthly saving.
- Inflation calculatorWhat a past dollar amount is worth today.
- Zakat calculatorZakat on cash, gold, silver and shares.
- Salary converterHourly, weekly, monthly and annual pay.
- Income tax (India)New and old regime side by side for this year.
- CTC to in-hand salaryMonthly in-hand pay from CTC, with PF on the ₹25,000 ceiling and professional tax.
- HRA exemptionExempt and taxable HRA from salary and rent.
- Gratuity calculatorGratuity under the Code on Social Security, from last-drawn wages and years of service.
- PPF calculatorPPF maturity at the 7.1% rate for October to December 2026.
- UK take-home pay2026/27 income tax, National Insurance and student loan from a salary.
- 13th month payPhilippine 13th month pay and the tax-free part.
- SSS, PhilHealth and Pag-IBIGEmployee and employer SSS, PhilHealth and Pag-IBIG from a monthly salary.
- Loan paymentEMI, total interest, prepayment savings and a year-by-year schedule.
- Mortgage calculatorMonthly payment with tax, insurance, PMI and HOA.
- UK stamp dutySDLT from 1 April 2025, with first-time buyer relief.
- Profit marginMargin, markup and selling price from your cost.
- Break-even calculatorUnits and sales that cover your fixed costs.
- Sales tax calculatorAdd or remove GST, VAT or a sales-tax rate.
- Gold jewellery priceRate times weight, plus making charges and GST.
- YouTube earningsDaily, monthly and yearly earnings from views and RPM.AdEarnings ProOpen
- GSTIN and PAN checkerFormat and check digit of a GSTIN or PAN.
- IBAN checkerCountry format and check digits of an IBAN.
Health and fitness
BMI, body fat, calories and macros, one rep max, cycles and a medicine chart.
- BMI calculatorBody mass index from height and weight.
- Body fat calculatorBody fat % by the US Navy tape method.
- Calorie needsBMR and a daily estimate from activity.
- Macro calculatorProtein, carbs and fat for your calorie goal.
- One rep maxEstimated 1RM and a percentage table from one set.
- Interval timerHIIT and Tabata rounds with beeps.
- Running pacePace per kilometre and per mile from a distance and a time.
- Water intakeA daily water amount from body weight.
- Sleep cyclesBedtimes that land on 90-minute cycles before you wake.
- Ovulation calculatorFertile window and ovulation day for the next cycles.
- Period calculatorYour next periods from your cycle length.
- Due date40 weeks from the first day of the last period.
- Medication scheduleA printable daily chart of medicines and times.
- Days supply calculatorWhen your pills run out and when to request a refill.Daily Pills | ReminderOpen
School and science
Graphs, statistics, equations, the periodic table, chemistry and times tables.
- Graphing calculatorPlot functions, zoom and find where they cross.
- Scientific calculatorTrig, logs, powers, memory and history.Units Converter & CalculatorOpen
- Quadratic solverRoots with the working, real or complex.
- LCM and HCF calculatorWith the prime factors and working.
- Fraction calculatorAdd, subtract, multiply and divide fractions.
- Area and volumeCircles, triangles, cylinders, spheres and more.
- Percentage calculatorA percent of a number, or the change between two numbers.
- Ratio calculatorSolve a proportion or simplify a ratio.
- Multiplication tablesAny times table to print or practise.
- Roman numeralsConvert between numbers and Roman numerals.
- Mean, median and modePlus the range, quartiles and outliers.
- Standard deviationSample and population, with the working.
- Periodic tableEvery element with its key data.
- Chemical equation balancerBalance a reaction and show the coefficients.
- Resistor color codeColour bands to ohms and back.
- GPA calculator4.0 GPA (weighted or not) or 10-point SGPA/CGPA, cumulative and percentage.
- Final gradeThe percent you need on the final to hit a target.
- Attendance calculatorClasses you can miss and still keep 75%.
SEO tools
Robots.txt, sitemaps, meta tags and schema, plus IP, SPF and DMARC records.
- Robots.txt generatorWrite a robots.txt with disallow paths and a sitemap URL.
- Robots.txt testerSee if a path is allowed for a crawler name.
- XML sitemap generatorBuild a sitemap from a list of URLs.
- Sitemap validatorCount URLs in a sitemap and flag duplicates.
- Meta tag generatorTitle, description, canonical, robots and Open Graph tags.
- SERP snippet previewSee how a title and description fit a search result.
- Open Graph previewPreview a link card from a title, description and image.
- Favicon generatorfavicon.ico, SVG favicon with dark mode, touch icon and web manifest in one ZIP.
- Keyword densityCount a phrase, or list the words you use most.
- Heading outlineList H1–H6 from pasted HTML.
- URL slug generatorTurn a title into a lowercase URL slug.
- UTM link builderAdd source, medium and campaign to a URL.
- Schema markup generatorJSON-LD for an FAQ, an article or breadcrumbs.
- Hreflang tag generatorAlternate links for each language URL.
- Redirect generatorApache and Nginx rules for a 301 or 302.
- Domain IP lookupA, AAAA, NS and MX records from public DNS.
- What is my IPYour public IP address and connection details.
- SPF record generatorBuild an SPF record and check a domain's record.
- DMARC record generatorBuild a DMARC policy and check a domain's record.
PDF tools
Merge, split, compress and convert PDFs, Word to PDF, resize, flatten and pull out images.
- Merge PDFJoin PDFs in an order you set, in this tab.
- Split PDFKeep a range, split by ranges or every N pages, or one PDF per page.
- Organize PDFReorder pages or drop the ones you do not want.
- Compress PDFShrink a PDF: keep the text, or redraw pages as JPEGs.
- Rotate PDFTurn selected pages by 90, 180 or 270 degrees.
- Crop PDFTrim the same margin, in millimetres, off every edge.
- PDF page numbersPage numbers in your format, position and page range.
- Watermark PDFStamp text across every page, diagonal or tiled.
- Sign PDFDraw, type or upload a signature and place it on any page.
- Fill PDF formEdit the form fields the PDF already has.
- PDF to JPGSave pages as JPG or PNG at 72, 150 or 300 DPI.
- PDF to textCopy the letters the PDF already stores as text.
- Unlock PDFRemove an open password you know, in your browser.
- Protect PDFAdd an AES-256 open password to a PDF, in this tab.
- Repair PDFRebuild a damaged PDF that will not open, with qpdf.
- Compare PDFSee which lines of text changed between two PDFs.
- PDF to MarkdownTurn a PDF's text into Markdown with headings and lists.
- PDF to WordA .docx with the headings, paragraphs, lists and pictures.
- PDF to ExcelTables to .xlsx sheets, numbers as numbers, columns you can adjust.
- PDF to PowerPointOne slide per page, as a sharp picture, in a .pptx.
- OCR PDFMake a scanned PDF searchable, in English or Hindi, on your device.
- Scan to PDFPhotos of pages, straightened and cleaned, in one PDF.
- Edit PDFAdd text, pictures, highlights, shapes and drawings to any page.
- Redact PDFBlack out words or areas so the text is really gone.
- Word to PDFTurn a .docx file into a PDF in your browser.
- Flatten PDFBake form fields and comments into the page.
- Extract images from PDFSave every picture stored in a PDF.
- Resize PDFA4 to Letter and back, or any page size.
Receipts & documents
Receipts, invoices, quotations, payslips, resumes, biodata, business cards and email signatures.
- Rent receiptA rent receipt with the month, address and amount in words.
- Payment receiptA receipt for a fee, a sale or any other payment.
- Donation receiptA donation receipt with the donor, amount and purpose.
- Invoice generatorInvoices with your logo, tax and a PDF.
- GST invoice generatorTax invoices with CGST, SGST, IGST and HSN codes.
- Quotation makerQuotes with a validity date, terms and a PDF.
- Salary slip generatorEarnings, deductions and net pay on a payslip PDF.
- Resume builderPick a template, fill each section, save a PDF.
- Marriage biodata makerBiodata with a photo and family details, as a PDF.
- Business card makerFront and back with a logo and QR, ten to a sheet.
- Email signature generatorSignatures for Gmail, Outlook and Apple Mail.
Device tests
Keyboard, mouse, gamepad and webcam tests, refresh rate, reaction time and internet speed.
- Keyboard testPress every key and see which ones register.
- Mouse and double-click testButtons, scroll wheel and double-click faults.
- Click speed testClicks per second over 1 to 60 seconds.
- Gamepad testerButtons, sticks, triggers and stick drift.
- Reaction time testMilliseconds from the signal to your click.
- Typing speed testWords per minute and accuracy on classic passages.
- Refresh rate testYour screen's real refresh rate in Hz.
- White screenFull-screen white, black or any colour.
- Webcam testLive preview, resolution and frame rate.Scan Via CamOpen
- Screen recorderRecord a screen, window or tab with your mic.
- Online mic testSee your mic level and waveform live, then play back a clip.Mic to SpeakerOpen
- Speaker testSpoken left/right check, an out-of-phase test, tones and a 20 Hz to 20 kHz sweep.Mic to SpeakerOpen
- Phone testCheck screen, touch, speakers, mic and cameras before a sale.Mic to SpeakerOpen
- Internet speed testDownload, upload and latency of your connection.
- What is my IPYour public IP address and connection details.
No tool matches that search. Try a shorter word, or browse the categories above.
Need more than a browser tab?
Each tool has an iPhone, Mac or Android app that keeps the job on your phone: offline, with history, reminders and the features a web page cannot reach.
- Currency Converter : Fast
- Converter : Units
- Bible - Read, Indulge, Grow
- Hanuman Chalisa : Offline
- DSA Master - Data & Algorithms
- Mandir Darshan
- Hashtags Creator
Facts and Quotes- Wallpapers HD: Exotic 4K
- Daily Pills | Reminder
- Track Your Pills
- Scan Via Cam
- Guitar Tuner: Chromatic
- Mic to Speaker - Virtual Mic
- Virtual Mic
- Haptics Explorer
- Drums n Piano
- AdEarnings Pro
- Push Notification - Tester
- Catalog - UI
- Novels Club
- Tic Tac Toe : Time Pass
- Marbles Popperz
- Speck Match
Questions
Are these tools really free?
Yes. Every tool on this page is free to use, with no account, no trial and no limit on how often you use it.
Is anything I use uploaded?
No. The tools run inside your browser. These pages don't upload your microphone audio, photos, text or push payloads, and they are gone when you close the tab, unless you download the result.
Do the tools work offline or on my phone?
They work in any current browser on a phone, tablet or computer. Most keep working without a connection once the page has loaded. Rates, times and other live data need a connection. When you want the same job every day on your iPhone, each tool links to the matching app.
Photo, PDF & social
Crop photos, passport photos, image to text, PDFs, quote images and symbols.