Free Online Tools
231 free tools for developers, designers, and content creators. No registration required, instant results.
Built and maintained by NKable. We build custom AI systems too →
🔥 Popular Tools
Every tool, by category
All 231 tools, grouped. Nothing here needs an account.
PDF Tools
- PDF to WordNEWConvert PDF to DOCX
- PDF to HTMLPDF → responsive HTML
- PDF to EPUBNEWPDF → e-reader format
- Word to PDFDOCX → PDF
- Excel to PDFXLSX → PDF
- HTML to PDFNEWWebpage → PDF
- Markdown to PDFNEWMD → PDF document
- Merge PDFCombine multiple PDFs
- Split PDFSplit into pages
- Compress PDFReduce file size
- Protect PDFAdd password lock
- Unlock PDFRemove password
- Add WatermarkNEWBrand & protect PDF
- Edit PDF MetadataNEWTitle, author, keywords
- View All PDF Tools →
SEO Tools
Data Convert
- CSV to JSONTabular → JSON object
- JSON to CSVJSON → spreadsheet
- CSV to ExcelCSV → XLSX file
- Excel to CSVXLSX → plain CSV
- JSON to YAMLJSON → YAML config
- YAML to JSONYAML → JSON object
- JSON to XMLJSON → XML markup
- XML to JSONXML → JSON object
- Excel to JSONSpreadsheet → JSON
- JSON to SQLNEWJSON array → INSERT statements
- CSV DeduplicatorNEWRemove duplicate CSV rows
- CSV ↔ XMLNEWConvert CSV and XML bidirectionally
- INI / TOML → JSONNEWConfig files → JSON
- CSV ViewerNEWRender CSV as sortable table
- JSON to TableNEWJSON array → sortable table
- TSV ↔ CSVNEWTab-separated ↔ comma-separated
- TSV to JSONNEWTab-separated values → JSON array
- CSV to SQLNEWCSV → SQL INSERT statements
- CSS ↔ JSONNEWCSS stylesheet ↔ JSON object
- TOML to JSONNEWTOML config → JSON object
- JSON to TOMLNEWJSON object → TOML config
- CSV Column ExtractorNEWPick & export specific CSV columns
- CSV to TSV ConverterConvert CSV to TSV in your browser
Text & Writing
- Word CounterNEWCount words & reading time
- Case ConverterNEWUPPER / camel / snake case
- Find & ReplaceNEWRegex find & replace text
- Sort LinesNEWSort lines A→Z, numeric, shuffle
- Remove DuplicatesNEWDeduplicate text lines
- Reverse TextNEWReverse chars / words / repeat
- Readability ScoreNEWFlesch-Kincaid grade level
- Text DiffNEWCompare two texts live
- Slug GeneratorNEWText → URL-friendly slug
- Lorem IpsumNEWGenerate placeholder text
- Morse CodeNEWText ↔ Morse code
- JSON FormatterNEWFormat, minify & validate JSON
- Cipher EncoderNEWROT13, Caesar, Vigenère, Morse
- Whitespace CleanerNEWTrim, collapse & normalize spaces
- Word FrequencyNEWTop word & char chart
- Text TruncatorNEWCut text by chars, words, sentences
- Char FrequencyNEWCharacter count & frequency chart
- Text RepeaterNEWRepeat text N times with separator
- Markdown PreviewNEWLive MD → HTML side-by-side
- Diff MergerNEW3-way text merge with conflicts
- ASCII Art GeneratorNEWText → block-letter ASCII art
- Anagram FinderNEWCheck anagrams & find word anagrams
- Text StatisticsNEW13 metrics: words, chars, reading time…
- Base64 DecoderBase64 decode
- Base64 EncoderTool to Base64 encode text or files
- Character CounterWith and without spaces
- Code Comparison ToolCompare code
- Code LinterOnline code linter
- CSS FormatterCSS formatter and minifier
- HTML FormatterHTML formatter and minifier
- HTML to Markdown ConverterConvert HTML to Markdown online free
- JavaScript FormatterJavaScript formatter and minifier
- JSON FormatterJSON formatter and validator
- Letter CounterLetter frequency breakdown
- Markdown to HTML ConverterConvert Markdown to HTML online free
- Palindrome CheckerReads the same both ways?
- Paragraph CounterCount paragraphs and blocks
- Line Break RemoverTool to remove line breaks from text
- Sentence CounterSentences and average length
- String ReverserReverse a string
- Text Comparison ToolCompare text
- Whitespace TrimmerTool to trim whitespace from text
- Word ScramblerShuffle the letters in words
Image Tools
Developer
- Base64 Encode/DecodeEncode or decode Base64
- URL Encode/DecodeURL-safe encoding
- Escape / UnescapeNEWHTML / JSON / URL / SQL / CSS
- CSS MinifierNEWCompress or format CSS
- Number to WordsNEW123 → one hundred twenty-three
- Hash GeneratorMD5 / SHA256 / SHA512
- QR Code GeneratorCreate QR codes instantly
- JWT DecoderNEWDecode JWT header & claims
- Regex TesterNEWTest regex with live highlights
- Cron Expression ParserNEWValidate & explain cron syntax
- SQL FormatterNEWBeautify or minify SQL
- Text to Binary / HexNEWText ↔ Binary / Hex / ASCII
- XML FormatterValidate & format XML
- HTML PreviewNEWLive HTML editor & preview
- JSON Tree ViewerNEWExplore JSON as collapsible tree
- JSON Schema GeneratorNEWInfer JSON Schema (draft-07) from sample
- JSON DiffNEWDeep-compare two JSON objects
- Regex CheatsheetNEWQuick regex reference + live tester
Utilities
- Password GeneratorNEWSecure random passwords
- UUID GeneratorNEWGenerate UUID v4 instantly
- IP Address InfoNEWYour IP, location & ISP
- User Agent ParserNEWDetect browser, OS & device
- Timestamp ConverterNEWUnix ↔ human date/time
- Number Base ConverterNEWBinary ↔ Hex ↔ Octal
- Roman NumeralNEWNumber ↔ Roman numeral
- Color ConverterNEWHEX ↔ RGB ↔ HSL
- Pomodoro TimerNEWFocus intervals & breaks
- Text to SpeechNEWHear any text read aloud
- Typing Speed TestNEWMeasure WPM & accuracy
- File Size CalculatorNEWBytes ↔ KB ↔ MB ↔ GB ↔ bits
- PX to REM / EMNEWCSS unit converter
- Stopwatch & TimerNEWStopwatch & countdown timer
- Currency FormatterNEWFormat numbers as USD, EUR, INR…
- Base ConverterNEWConvert any base 2–36 (Binary, Hex…)
- ZIP CreatorNEWCreate ZIP archives in your browser
- HTTP Status CodesNEWSearchable reference of all HTTP codes
- chmod CalculatorNEWUnix file permissions octal ↔ symbolic
- Number FormatterNEWFormat numbers: commas, scientific, compact
- CSS Unit ConverterNEWpx ↔ rem ↔ em ↔ vh ↔ vw ↔ pt
- OG / Social PreviewNEWTwitter, Facebook, LinkedIn card preview
- Random Data GeneratorNEWFake names, emails, UUIDs, IPs in bulk
- Favicon GeneratorNEWText/emoji → 16–128px PNG favicon
- EXIF ViewerNEWRead image metadata: camera, GPS, ISO
- Password StrengthNEWEntropy, crack-time & security score
- HTML EntitiesNEW60+ HTML entity codes + encoder
- Sticky NotesNEWDraggable notes board in browser
- DNS Records ReferenceNEW14 record types with examples & use cases
- Batch Barcode GeneratorBarcode generator with PNG download
- Bulk Dummy Data GeneratorBulk dummy data
- Random Token GeneratorTokens from a crypto source
- Code 128 Barcode GeneratorCode 128 → print-ready PNG
- File Checksum VerifierFile checksum
- Fake Data GeneratorFake data generator for development and QA
- SHA-256 Hash GeneratorSHA-256 hash generator for text and files
- SHA-512 Hash GeneratorSHA-512 hash generator for text and files
- Text to Hex ConverterText ↔ hexadecimal
- HMAC GeneratorHMAC generator using SHA-256
- HTML DecoderEntities → plain characters
- HTML EncoderCharacters → HTML entities
- Random String GeneratorRandom strings, your alphabet
- String Unescape ToolTool to unescape a string
- URL DecoderPercent-encoding → plain text
Design
- CSS Gradient GeneratorNEWLinear / radial / conic CSS gradients
- Color PaletteNEWGenerate harmonious color schemes
- Box Shadow GeneratorNEWVisual CSS box-shadow builder
- Border Radius BuilderNEWCSS border-radius per corner
- Color ExtractorNEWExtract HEX/RGB colors from CSS/HTML
- Color Blind SimulatorNEWSee colors as colorblind users would
- Color Gradient MixerNEWInterpolate N colors between two hex colors
- Color Name FinderNEWFind CSS name for any hex color
- Brand Colour Scheme BuilderColor scheme generator
- Gradient Background GeneratorBackgrounds with live preview
- CSS Image FiltersCSS image filters tool
Calculators
- Unit ConverterNEWLength, weight, temp, speed & more
- Loan / EMI CalculatorNEWMonthly payment & amortization
- Tip CalculatorNEWTip & bill split among friends
- Random NumberNEWGenerate numbers in any range
- Percentage CalculatorNEWX% of Y, % change & more
- Age CalculatorNEWExact age in years, months, days
- BMI CalculatorNEWBody Mass Index, metric & imperial
- Date DifferenceNEWDays & weeks between dates
- Scientific CalculatorNEWFull scientific calc in browser
- Bitwise CalculatorNEWAND, OR, XOR, NOT, shifts
- Aspect Ratio CalculatorNEWWidth / height for any ratio
- Fibonacci & PrimeNEWPrime check, factorize, Fibonacci seq
- Time CalculatorNEWAdd or subtract multiple durations
Text Pro
- Text TranslatorNEWOffline text translation using browser APIs
- Text to SpeechNEWConvert text to speech with voice selection
- Speech to TextNEWVoice recognition to text
- Text SummarizerNEWAI-powered text summarization
- Keyword ExtractorNEWExtract keywords from text
- Readability ScorerNEWCalculate readability scores
- Text EncryptorNEWSimple text encryption/decryption
- Morse CodeNEWText to Morse code converter
- Phonetic ConverterNEWConvert text to phonetic alphabet
- Text AnalyzerNEWDeep text analysis and stats
- AI Text HumanizerAI humanizer
- View All Text Pro →
Code Pro
- Regex TesterNEWTest and validate regular expressions
- JSON ValidatorNEWValidate JSON with detailed errors
- YAML ValidatorNEWValidate YAML syntax
- CSV ValidatorNEWValidate CSV structure
- HTML ValidatorNEWValidate HTML markup
- CSS ValidatorNEWValidate CSS rules
- Code BeautifierNEWUniversal code formatter
- Code MinifierNEWUniversal code minifier
- Code ConverterNEWConvert between languages
- API TesterNEWTest HTTP requests client-side
- View All Code Pro →
Data Tools
- CSV EditorNEWAdvanced CSV editor with filtering
- CSV to JSONNEWConvert CSV to JSON
- JSON to CSVNEWConvert JSON to CSV
- CSV to XMLNEWConvert CSV to XML
- JSON to XMLNEWConvert JSON to XML
- JSON to YAMLNEWConvert JSON to YAML
- YAML to JSONNEWConvert YAML to JSON
- Data GeneratorNEWGenerate test data patterns
- Table GeneratorNEWGenerate HTML/Markdown tables
- Chart Data BuilderNEWBuild data for charts
- Multi-Format Barcode GeneratorBarcode generator supporting Code 128
- Data FormatterDedupe, sort and clean a list
- Mock Data GeneratorMock records from a schema
- Date CalculatorAdd, subtract and diff dates
- Placeholder Text GeneratorFiller by paragraph or word
- Secure Password CreatorStrong, with a strength meter
- QR Code Generator with SVG ExportQR code SVG
- Random Number GeneratorRanges, decimals, no repeats
- Timezone ConverterCompare a time across cities
- Advanced Unit Converter50+ units, nine categories
- View All Data Tools →
Security
- Password AuditorNEWCheck password strength and patterns
- JWT DecoderNEWDecode and verify JWT tokens
- Hash GeneratorNEWGenerate various hashes
- XSS ScannerNEWBasic XSS vulnerability scanner
- Privacy Policy GeneratorNEWGenerate privacy policies
- Multi-Algorithm Checksum GeneratorChecksum generator producing MD5
- HMAC Signature VerifierHMAC signature
- SHA-256 Checksum ToolSHA-256 checksum
- SHA-512 Checksum ToolSHA-512 checksum
- View All Security Tools →
Need something these do not do?
Ask for a tool and it may get built. Need it for your business, with your data in it? That is a project.
About the NKable Tools
NKable is a catalogue of more than 240 free online tools grouped into PDF editing, file conversion, calculators, text utilities, design tools, developer utilities and SEO analysis. Most run entirely in your browser with no account and no upload.
These free online tools cover the small jobs that interrupt real work: merging a PDF, converting a spreadsheet to JSON, checking a word count against a limit, picking a colour palette, decoding a token, or working out what a cron expression actually does.
The organising principle is that a tool should open and work. No account, no email capture, no trial that expires, and no watermark on the output. Most run entirely in your browser, which means nothing you paste or select is uploaded — the exceptions are the PDF, Excel and image tools, whose parsing libraries are too heavy to ship to a phone.
Use the search box if you know what you need, or browse the categories below. Every tool page explains what it does, how to use it, and where its limits are.
How to use the NKable Tools
- Search or browse. Type what you need, or pick a category below.
- Open the tool. No signup, no account and no email required.
- Add your input. Paste text or select a file, depending on the tool.
- Take the result. Copy the output or download the finished file.
NKable Tools features
- PDF merging, splitting, compression and conversion
- CSV, JSON, XML, YAML and Excel converters
- Calculators for finance, health, dates and units
- 45+ text tools for counting, formatting and comparing
- CSS design tools with live preview
- Developer utilities and quick reference pages
- No account, no watermark and no upload for most tools
Frequently asked questions
Are all the tools free?
Yes. Every tool is free with no account, no trial period, no watermark and no paid tier.
Do I need to sign up?
No. Nothing on the site requires an account or an email address.
Are my files uploaded?
Most tools run entirely in your browser. The PDF, Excel and image tools use the server, and each says so on its page.
Do the tools work on mobile?
Yes. Every tool works in a mobile browser, including file selection where relevant.
How many tools are there?
More than 240, across PDF, converters, calculators, text, design, data, security, network and developer utilities.