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129 free developer tools

For developers, designers, and content creators. No sign-up required — your data never leaves your browser.

129 tools · 8 categories

Popular · start here

Twelve to start with

Hand-picked from the catalogue — the everyday ones. One tap, no sign-up.

Text & Content · 24 tools

Text & Content

Text manipulation, formatting, and analysis tools

  1. Word CounterEvery character countsCount words, characters, sentences, and paragraphs
  2. Case ConverterTransform text instantlyConvert text between uppercase, lowercase, title case, and more
  3. Text DiffSpot the differenceCompare two texts and highlight differences
  4. Lorem Ipsum GeneratorPlaceholder perfectionGenerate placeholder text for designs
  5. Markdown PreviewWrite. Preview. Ship.Write and preview markdown with live rendering
  6. Text ReverserFlip it aroundReverse text characters or words
  7. Line SorterOrder in secondsSort lines alphabetically or by length
  8. Duplicate RemoverClean duplicates fastRemove duplicate lines from text
  9. Character CounterDetailed text analysisAdvanced character and text statistics
  10. Whitespace RemoverClean text instantlyRemove extra spaces and whitespace
  11. Line CounterCount every lineCount lines in text content
  12. Text ShufflerRandomize anythingShuffle lines or words randomly
  13. Text RepeatMultiply your textRepeat text multiple times
  14. Word FrequencyAnalyze word usageCount word occurrences in text
  15. Text WrapperWrap to any widthWrap text to specified line width
  16. Email ExtractorFind emails instantlyExtract email addresses from text
  17. Text StatisticsDeep text analysisComprehensive text analysis and statistics
  18. Text TruncateShorten smartlyTruncate text to specified length
  19. Text to ListList in any formatConvert text to various list formats
  20. ASCII Art GeneratorText becomes artGenerate ASCII art from text
  21. Markdown Table GeneratorTables made easyGenerate markdown tables visually
  22. Code Comment GeneratorDocument your codeGenerate code comments and documentation
  23. Reading Time EstimatorTime to readEstimate reading and speaking time
  24. List ComparisonCompare listsFind differences between two lists
Developer Tools · 31 tools

Developer Tools

JSON, XML, SQL, code utilities, and web debugging

  1. JSON FormatterInstant beautificationFormat, validate, and beautify JSON data
  2. JSON Path FinderFind any pathQuery and navigate JSON with JSONPath
  3. JSON SorterOrder your JSONSort JSON object keys alphabetically
  4. JSON to YAMLFormat conversionConvert between JSON and YAML
  5. XML FormatterBeautiful XMLFormat and beautify XML documents
  6. SQL FormatterReadable queriesFormat and beautify SQL queries
  7. CSS MinifierCompress CSSMinify CSS for production
  8. JS MinifierCompress JavaScriptMinify JavaScript code
  9. HTML MinifierCompress HTMLMinify HTML for production
  10. Regex TesterTest patterns liveTest and debug regular expressions
  11. Regex LibraryReady-to-use patternsCommon regex patterns for developers
  12. Cron ParserUnderstand cronParse and explain cron expressions
  13. UUID GeneratorUnique IDs instantlyGenerate UUIDs in various formats
  14. Slug GeneratorURL-safe slugsGenerate URL-friendly slugs
  15. Tab to Space ConverterIndent your wayConvert tabs to spaces and vice versa
  16. URL ParserDissect any URLParse and analyze URL components
  17. URL ValidatorValidate URLsCheck URL validity and security
  18. IP Address AnalyzerView & analyze IPsView your public IP and analyze any IP address
  19. CSV to JSONData conversionConvert CSV data to JSON
  20. JSON to CSVExport to CSVConvert JSON to CSV format
  21. List to JSONLists become JSONConvert text lists to JSON arrays
  22. YAML FormatterFormat YAML beautifullyFormat and validate YAML with JSON conversion
  23. Meta Tags GeneratorSEO made simpleGenerate SEO meta tags for websites
  24. Code FormatterPrettier for everyoneFormat code in multiple languages
  25. HTML to MarkdownClean conversionConvert HTML to Markdown format
  26. SVG OptimizerSmaller SVGsOptimize SVG files for web usage
  27. Synthetic Data GeneratorTest data fastGenerate realistic synthetic data for testing
  28. Robots.txt GeneratorSEO controlGenerate robots.txt for search engines
  29. .htaccess GeneratorApache configGenerate .htaccess for Apache servers
  30. User Agent ParserAnalyze browsersParse user agent strings
  31. ASCII ConverterText to codesConvert between text and ASCII codes
Design & CSS · 10 tools

Design & CSS

Colors, gradients, typography, and CSS utilities

  1. Color ConverterAny color formatConvert between HEX, RGB, HSL, and more
  2. Color Palette GeneratorCreate palettesGenerate harmonious color palettes
  3. Color Shade GeneratorPerfect shadesGenerate shades and tints from any color
  4. Gradient GeneratorBeautiful gradientsCreate CSS gradients visually
  5. Box Shadow GeneratorPerfect shadowsGenerate CSS box shadows visually
  6. Aspect Ratio CalculatorPerfect proportionsCalculate and convert aspect ratios
  7. Font PreviewPreview any fontPreview and compare fonts
  8. Emoji PickerFind any emojiSearch and copy emojis
  9. CSS Unit ConverterConvert CSS unitsConvert between px, rem, em, and more
  10. Color Contrast CheckerWCAG compliance checkCheck color contrast for accessibility
Image & Media · 17 tools

Image & Media

Image, GIF, audio, QR codes, and media tools

  1. Lorem PicsumPlaceholder imagesGenerate placeholder images
  2. QR Code GeneratorQR codes instantlyGenerate QR codes for URLs and text
  3. Image CompressorShrink images instantlyCompress images with quality control
  4. Image ResizerResize with precisionResize images with aspect ratio control
  5. QR Code ScannerScan any QR codeScan QR codes from camera or images
  6. Barcode GeneratorGenerate any barcodeCreate barcodes in multiple formats
  7. Image CropperCrop with precisionCrop images with aspect ratio presets
  8. Image Format ConverterConvert any formatConvert images between PNG, JPEG, WebP
  9. GIF MakerCreate animationsCreate animated GIFs from images
  10. GIF TrimmerTrim animationsTrim animated GIFs by selecting frame range
  11. GIF CompressorCompress GIFsCompress GIF files by reducing colors and dimensions
  12. Icon GeneratorApp icons made easyGenerate app icons for iOS, Android, Web
  13. Subtitle EditorEdit subtitlesEdit SRT subtitle files
  14. Audio TrimmerTrim audioTrim audio files to a specific range
  15. Image Collage MakerCreate collagesCombine multiple images into a collage
  16. Device Frame ToolAdd mockupsAdd device frames to screenshots
  17. Outline ExtractorExtract edgesExtract outlines from images
Encoding & Encryption · 14 tools

Encoding & Encryption

Base64, hash, JWT, and encoding tools

  1. Base64 Encoder/DecoderEncode anythingEncode and decode Base64 strings and files
  2. URL Encoder/DecoderSafe URLs alwaysEncode and decode URLs and query parameters
  3. HTML Encoder/DecoderEscape HTML safelyEncode and decode HTML entities
  4. HTML Entity ConverterEntity conversionConvert between HTML entities and characters
  5. Hash GeneratorOne-click hashingGenerate MD5, SHA-1, SHA-256, and other hashes
  6. JWT DecoderDecode tokens fastDecode and inspect JWT tokens
  7. Text to BinaryBinary conversionConvert text to binary and back
  8. Text to HexHex encodingConvert text to hexadecimal
  9. Morse CodeDots and dashesConvert text to Morse code
  10. ROT13 EncoderSimple cipherEncode and decode ROT13 cipher
  11. String EscapeEscape special charsEscape special characters in strings
  12. JSON EscapeEscape for JSONEscape strings for JSON
  13. Image to Base64Images as textConvert images to Base64 strings
  14. Number Base ConverterAny base, any numberConvert between binary, octal, decimal, hex
Calculators · 14 tools

Calculators

Math, date, and utility calculators

  1. Percentage CalculatorQuick percentagesCalculate percentages easily
  2. Unit ConverterConvert any unitConvert between various units
  3. Timestamp ConverterUnix time made easyConvert Unix timestamps to dates
  4. Date CalculatorDate math made easyCalculate date differences
  5. Age CalculatorExact age instantlyCalculate exact age from birthdate
  6. Random Number GeneratorTrue randomnessGenerate random numbers
  7. Binary CalculatorBinary mathPerform binary calculations
  8. Number FormatterFormat any numberFormat numbers for different locales
  9. Prime Number CheckerIs it prime?Check if numbers are prime
  10. String Length CalculatorMeasure stringsCalculate string length in various formats
  11. BMI CalculatorHealth insightsCalculate BMI with health indicators
  12. Tip CalculatorSplit bills easilyCalculate tips and split bills
  13. Scientific CalculatorAdvanced mathFull-featured scientific calculator
  14. Discount CalculatorCalculate savingsCalculate discounts and final prices
Security & Privacy · 7 tools

Security & Privacy

Passwords, encryption, redaction, and privacy tools

  1. Password GeneratorSecure in secondsGenerate strong, secure passwords
  2. EXIF ViewerSee image metadataView and remove EXIF metadata from images
  3. Photo Redaction ToolProtect privacyBlur or redact parts of images
  4. File EncryptorSecure your filesEncrypt files with AES-256-GCM
  5. File DecryptorUnlock filesDecrypt encrypted files
  6. Text Redaction ToolProtect privacyRedact sensitive information from text
  7. Passphrase GeneratorSecure passwordsGenerate memorable passphrases
Productivity · 12 tools

Productivity

PDF, files, and everyday productivity tools

  1. Time Zone ConverterWorld time at onceConvert between time zones
  2. PDF MergerCombine PDFs easilyMerge multiple PDF files into one
  3. PDF SplitterSplit PDFs instantlySplit PDF into individual pages or ranges
  4. PDF EditorEdit PDFs easilyView, edit, and manipulate PDF files
  5. ZIP ToolCompress & extractCreate and extract ZIP archives
  6. File ConverterConvert any fileConvert between file formats
  7. File RenamerBatch renameBatch rename files with patterns
  8. CSV EditorEdit spreadsheetsEdit CSV files in a spreadsheet interface
  9. Clipboard ManagerTrack historyManage clipboard history
  10. Budget PlannerTrack financesPlan and track your budget
  11. Habit TrackerBuild habitsTrack daily habits and streaks
  12. FlashcardsStudy smarterCreate and study flashcards
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