Comprimir PDF — Herramienta Online Gratuita
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By the AllFileBox Team · Last updated: 2026-06-26
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Compress PDF is a free online tool that reduces the file size of a PDF directly in your browser, so it downloads, emails, and uploads faster without losing readable text or sending your document to a server.
What PDF compression actually does
A PDF is usually heavy because of the images embedded inside it, not the text. Compression re-encodes those images at a sensible quality and strips redundant data such as duplicate fonts and unused objects. Text stays vector and fully selectable, so the words remain crisp at any zoom while the overall size often drops by 30 to 70 percent. Scanned PDFs, which are really pictures of pages, shrink the most.
When to compress a PDF
Email systems frequently reject attachments above 10 to 25 MB, contact forms cap uploads even lower, and many government and banking portals refuse files over 5 MB. Compressing before you send keeps you under those limits. It also speeds up page loads when a PDF is hosted online and saves storage when you archive hundreds of documents at once.
Quality versus size
Lower quality means smaller files, so the right setting depends on the job. A contract that is mostly text compresses heavily with no visible change. A portfolio full of photographs needs a gentler setting to keep detail. Because the preview is generated locally you can try a level, check the result, and re-run in seconds until the balance is right.
Private, browser-based processing
Compress PDF runs entirely in your browser using WebAssembly. The document is read into memory, rebuilt smaller, and handed back as a download. Nothing is uploaded, stored, or logged, which makes it safe for contracts, medical records, and financial statements. Closing the tab clears the file from memory immediately.
Cómo Usar Comprimir PDF
- Open the Compress PDF tool and add your file.
- Choose a compression level that fits your quality needs.
- Let the tool rebuild the PDF in your browser.
- Check the new file size shown in the result.
- Download the compressed PDF.
Fit an email attachment limit
Fit an email attachment limit
Drop in a PDF that is too large to email, compress it below the 25 MB Gmail limit, and download a version that sends without bouncing.
Speed up a web download
Shrink a brochure or report before hosting it so visitors on slow connections open it in a fraction of the time.
Archive scanned documents
Compress stacks of scanned pages to a manageable size before backing them up, saving disk space without losing legibility.
| PDF type | Main content | Typical size reduction |
|---|---|---|
| Text document | Vector text | 10 to 30 percent |
| Mixed report | Text plus images | 30 to 60 percent |
| Scanned pages | Page images | 50 to 80 percent |
| Photo portfolio | High-res photos | 20 to 45 percent |
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