Free online tools that run in your browser
Format JSON, count words, compare text, convert units, compress images and merge PDFs — without sending a single file to a server. Pick a tool below and start working right away.
Try “json”, “password” or “pdf”.
Popular tools
The utilities people open most often.
- JSON FormatterFormat, minify and validate JSON.
- Base64 Encoder / DecoderConvert text to Base64 and back, Unicode-safe.
- UUID GeneratorGenerate random v4 UUIDs in bulk.
- Password GeneratorBuild strong passwords with local randomness.
- Word CounterCount words, sentences and reading time.
- Text CompareSee line-by-line differences between two texts.
- Case ConverterSwitch between title, camel, snake and kebab case.
- Timestamp ConverterConvert Unix time to readable dates and back.
- Percentage CalculatorPercent of a number, share of a total, and change.
- Unit ConverterConvert length, temperature and data sizes.
- Image CompressorShrink and resize images without uploading them.
- Merge PDFCombine several PDFs into one document.
All tools by category
Every tool has its own page with instructions, examples and answers to common questions.
Developer tools
Format, encode and generate the values you need while building.
- JSON FormatterFormat, minify and validate JSON.
- Base64 Encoder / DecoderConvert text to Base64 and back, Unicode-safe.
- URL Encoder / DecoderPercent-encode URLs and query values.
- HTML Encoder / DecoderEscape and unescape HTML entities.
- UUID GeneratorGenerate random v4 UUIDs in bulk.
- Password GeneratorBuild strong passwords with local randomness.
- Color ConverterConvert between HEX, RGB and HSL.
Text tools
Count, clean, compare and reshape text for writing and SEO.
- Word CounterCount words, sentences and reading time.
- Character CounterCount characters, bytes and platform limits.
- Text CompareSee line-by-line differences between two texts.
- Remove Duplicate LinesKeep only the unique lines in a list.
- Sort LinesSort a list alphabetically, numerically or by length.
- Case ConverterSwitch between title, camel, snake and kebab case.
- Slug GeneratorTurn a title into a clean URL slug.
- Lorem Ipsum GeneratorGenerate placeholder paragraphs, sentences or words.
Date & time
Read and convert timestamps in the formats systems expect.
Calculators
Quick everyday maths with the formula shown up front.
Converters
Switch between units and measurement systems.
Image tools
Resize and shrink pictures without leaving your browser.
PDF tools
Work with PDF documents locally on your own device.
Why work here
Your files stay on your device
Text, images and PDFs are processed by your own browser. Nothing is uploaded, stored or logged.
Results without waiting
There is no upload step and no queue. Paste or drop your input and the answer appears as you type.
Available in 12 languages
Navigation, tool labels and help text are translated, so you can work in the language you think in.
No account, no limits
Every tool is free to use, with no sign-up, no file-size quota and no watermark on your output.
Common questions
- Are my files uploaded to a server?
- No. Every tool listed here runs entirely in your browser using standard web APIs. The server only sends the page itself.
- Do I need to create an account?
- No. There is no sign-up, no email and no paid tier. Open a tool and use it.
- Can I use these tools offline?
- Once a tool page has loaded, the calculation itself needs no network connection, because it happens on your device.