Quality and privacy
What we promise, measured. No fine print: these are the tests we ran and what came out.
Your files don't leave your device
- The PDF and photos tools work inside your browser: the file is read, processed and downloaded on your device. It isn't uploaded to any server, so there are no copies of ours to delete.
- The artificial intelligence models (remove background, enlarge, OCR) are downloaded from kit593 the first time and run on your device. Translate and summarize use your browser's built-in AI, also on the device.
- Your electronic signature .p12 and its password only exist in the tab's memory while you sign: they are not saved or sent. When you close the tab, they disappear.
- The passwords you put on a PDF aren't stored either: if you forget it, no one can recover it.
- The only thing stored in the cloud is what you decide to save with your account (business details, quotes, catalogs). We explain it in the privacy policy.
Check it yourself: on a computer, open the browser's developer tools (F12) on the “Network” tab and process a file. You will see that only parts of the site itself are downloaded (code and models); your file is never sent.
Measured results
| Tool | Test | Result |
|---|---|---|
| Compress PDF | 4-page PDF with 6 MP JPEG photos | 1.77 MB → 188 KB (89% smaller) in 2.9 s |
| Pasar a texto (OCR) | Page scanned at 150 dpi, straight | 100% of words correct |
| Pasar a texto (OCR) | Same page skewed 1.2° and 2.5° | 100% (the page straightens itself) |
| Pasar a texto (OCR) | 2 pages in JPEG at 60%, blurred, noisy and skewed | 95 % of words; the errors were spaces after bullets · 7.6 s |
| PDF to PDF/A | 6 PDFs from different sources (Word/LibreOffice, jsPDF, MuPDF, rotated page, non-embedded fonts) | 6 of 6 approved as PDF/A-2b by veraPDF 1.30 |
| Protect PDF | Encrypt and open in another reader | 256-bit AES (PDF 2.0 standard, R6); asks for the password |
| Repair PDF | PDF without a cross-reference table or end of file | 3 of 3 pages recovered, with their text |
| PDF to Word | 3-page report with headings, bullets and an image | All the text, bold, alignment and image; 2 s |
| Compare PDFs | Two versions with 3 changes (two numbers and a new bullet point) | 3 of 3 changes found |
| Signaturer PDF (.p12) | Signing and co-signing a resolution already signed by a certification authority | Valid PAdES signature (pyHanko); the previous signature remains intact |
How we measure
Tests from October 21, 2026 with sample files created for each case, in Chromium simulating a phone with a 4x slower processor (the times) and on a computer (the rest). OCR accuracy was calculated word by word against the original text. They're small samples: with your documents the results may vary, especially with dark photos or handwriting.
Templates
- Read, merge, split, compress, sign, protect, unlock, repair, number, watermark, edit, compare, PDF/A, translate and summarize
- Images
- JPG, PNG, WebP, HEIC (depending on the browser), GIF and BMP
- Office
- Word (.docx), Excel (.xlsx, .csv) and PowerPoint (.pptx). Old formats (.doc, .xls, .ppt) are not accepted: save them in the new format
- Output
- PDF, PDF/A-2b, Word, Excel, PowerPoint, JPG, PNG, text and ZIP
Limits and quotas
Almost all PDF and photo tools are free with no daily limit. Since they run on your device, the maximum size depends on its memory (up to 200 MB per file; less on phones with little memory). Each tool's quotas are in the limits table.