UtilTray is a collection of 124 free tools for everyday tasks: merging PDFs, converting and compressing photos, counting words, formatting JSON and more. Tools marked “stays on this device” process your files and text locally. The HTTP Request Tester sends requests directly to the address you choose, as its privacy label explains.
Why we built it
Most online tools ask you to upload your files to their servers, often covered in adverts and fake download buttons, sometimes with limits that push you towards a subscription. Uploading a contract, a passport scan or a photo of your children to an unknown server just to merge or resize it shouldn’t be necessary. Modern browsers are powerful enough to do this work themselves, so that is how these tools are built.
What we promise
- No uploads. Tools marked “stays on this device” never send your files or text to us. See how this works.
- No account, no limits. Use any tool as often as you like, with files as large as your device can handle.
- No watermarks or hidden changes to your files.
- Honest labels. If a tool ever needs the internet to work, it says so clearly.
The tools
- PDF tools: Compress, merge, split, reorder and convert PDF files, and add page numbers or watermarks, without uploading them.
- Image tools: Convert, compress, resize and crop photos, and remove hidden location data, on your own device.
- Text tools: Count words, change case, clean up lists, compare text and preview Markdown.
- JSON & data tools: Format, validate, compare and convert JSON, YAML, XML and CSV data.
- Generators: Create QR codes, strong passwords and unique IDs such as UUIDs, NanoIDs and MongoDB ObjectIds.
- Security tools: Decode JWTs and TLS certificates, create hashes and HMAC signatures, and verify file checksums.
- Date & time tools: Convert time zones, count days between dates, convert timestamps and ISO 8601 dates, and build or explain cron schedules.
- Encoding tools: Encode and decode Base64, URLs and HTML entities.
- HTTP & API tools: Test API requests, convert cURL commands, sanitize HAR files, validate OpenAPI specs and inspect HTTP headers.
- File tools: Transfer files and text directly between your devices, without cloud uploads.
- Finance calculators: Work out mortgage payments, loan costs, savings growth, tips and take-home pay, privately in your browser.
- Health calculators: Due dates, fertile windows, BMI, calorie needs and sleep cycles — calculated privately in your browser.
- Unit converters: Convert length, weight, temperature, volume, speed, data and more using exact international factors.
- Math calculators: Work out percentages, changes and everyday arithmetic, with the formula shown.
How it’s built
The site is a set of static pages. The tools use standard browser technology (JavaScript, WebAssembly, Canvas and Web Workers) together with well-known open-source libraries such as Mozilla’s pdf.js. Pages are kept small so they load quickly on phones and slow connections.