Token Counter
Count tokens with real OpenAI tokenizers (cl100k_base / o200k_base).
TokenTokenizerGPT
Free • Privacy first • No registration
Your all-in-one free online toolbox
Free, privacy-first online toolbox: files are processed locally in your browser and never uploaded to a server.
- 81
- Free tools
- 16
- Reviewed flagships
- No
- Account needed
- 2
- Languages
Why OmniTool?
Built for speed, privacy and straightforward access.
Privacy by design
File and text processing stays in your browser whenever possible; network tools clearly disclose external requests.
Reproducible checks
Featured pages document concrete inputs, expected outputs and the checks used to validate them.
Standards and limits
Guides cite primary specifications where relevant and state important limitations instead of hiding them.
Human maintained
Flagship tools show who maintains the page, how it was checked and when it was last reviewed.
Featured, reviewed tools
Start with tools whose examples, limits and verification method have been editorially reviewed.
AI Tools
Developer Tools
JSON Formatter
Format, validate and minify JSON in your browser. No data is ever uploaded.
JSONValidateMinify
JSON Diff
Compare two JSON documents side by side and see differences instantly.
JSONCompareDiff
JWT Decoder
Decode JWT tokens, inspect the header and payload, and verify signatures.
JWTTokenAuth
Base64 Encoder/Decoder
Encode text or files to Base64, or decode Base64 back to readable text.
Base64EncodeDecode
Hash Generator
Generate SHA-1/256/384/512 and MD5 hashes using your browser Web Crypto.
SHAMD5Hash
Cron Expression Parser
Parse cron expressions into a human-readable schedule with next run times.
CronSchedulecronjob
Regex Tester
Test JavaScript regular expressions with live match highlighting.
正则regex测试
Password Generator
Generate strong, secure passwords with a strength meter.
密码password生成
Network Tools
Time & Date
Image & Media
PDF & Documents
Frequently asked questions
Are my files uploaded to a server?
File-processing tools keep your files in the browser. Network and AI tools only send requests when their function requires it and identify that behavior on the page.
Is OmniTool really free?
Yes. OmniTool is free to use. Its independent hosting and maintenance may be supported by clearly identified advertising.
Which browsers are supported?
All modern browsers — Chrome, Edge, Firefox and Safari. Tools that use Web Crypto require HTTPS, which we provide by default.
Is there a file size limit?
The only limit is your device memory. Large PDFs and images are processed in chunks when possible.