¿Puedo comprimir PDF online sin subirlo?
Yes. Your file stays entirely in your browser: the PDF is read via the File API, analyzed with PDF.js, re-encoded at a lower resolution or bitrate, and rebuilt locally with pdf-lib. No request carries the file bytes, so there is no server access to the document at any point — a true in-browser flow you can verify in DevTools → Network.
¿Mi archivo sale de mi navegador?
No, the file never leaves your browser. It lives in memory for the duration of the compression and is discarded when you close the tab. There is no upload, no temporary server copy, and no server access at any point — the only outbound requests the page makes are for its own static assets (HTML, CSS, fonts, icons).
¿Es segura la compresión PDF en el cliente?
Yes — it's safer than the server-side alternative. Because there is no upload, there is no server that can log, retain, or accidentally leak your PDF. Every transformation happens in your browser, so the usual risks of online PDF compressors (vendor retention, breach exposure, access logs you can't audit) don't apply. Endpoint security still matters — keep your browser up to date and avoid running the compressor on a machine you don't trust.
¿Es este un compresor PDF privado?
Yes, this is a private PDF compressor in two concrete senses. First, no upload: your browser processes the file locally, so the PDF bytes never reach our infrastructure. Second, no account: there is no login, no server-side history, and no cached copy of what you compressed. A page refresh brings you back to an empty compressor, and nothing about the session is recoverable from our side — because we never had it.
¿Qué pasa con mi archivo tras la compresión?
After compression, nothing remains on our side. The PDF is held only in your browser's memory during the run and is released when you close or reload the tab. The compressed PDF downloads straight to your device's Downloads folder. We don't keep the source PDF, don't keep the compressed copy, and don't maintain a session history — there is no server access to any of it.
¿Cuánto puede reducir esto el tamaño del PDF?
Typical reductions depend on the source. Scanned PDFs commonly shrink 70–90% because their embedded images have the most room for re-encoding. Text-heavy PDFs shrink 10–30% because the text stream is already small. Mixed documents land in between — usually 40–60%. Running the conservative "Keep Text & Layout" mode first and switching to "Smallest" only if needed is a good rule of thumb.
¿La compresión reduce la calidad?
It depends on the mode you pick. The "Keep Text & Layout" mode preserves searchable text and vector graphics — text stays crisp and selectable, only embedded images are re-encoded. More aggressive modes (Mixed, Scanned, Smallest) flatten pages to images and re-encode at lower bitrates, which trades visual fidelity for file size. Because this is a private PDF compressor running entirely in your browser, you can experiment with modes without re-uploading anything. For the deeper writeup on fidelity-preserving compression, see
compress PDF without losing quality.
¿Hay un límite de tamaño?
The practical limit is your device's available RAM, not a hard-coded cap. Very long PDFs (hundreds of pages) or high-resolution scans may slow down or stall on memory-constrained machines. If that happens, process the document in smaller ranges or pick a less aggressive mode. Because compression runs locally, there is no server-side upload size or request-timeout restriction.
¿Cómo comparto el PDF comprimido en privado?
Send it through an
end-to-end encrypted link instead of attaching it to email. For private file sharing, the server only ever holds ciphertext, the recipient decrypts in their own browser, and the link can be set to expire or self-destruct on first read.
¿Cómo comprimir PDF en Windows?
Open this PDF compressor in any modern browser on Windows — Chrome, Edge, or Firefox all work the same way on Windows 10 and Windows 11. Pick a PDF with the file picker or drag it into the page, choose a compression mode, and download the smaller file to your Downloads folder. There is no Windows installer, no administrator permission, and no driver setup — everything runs inside the browser's tab. If you also need to combine several PDFs before compressing,
merge them online first.
¿Cómo comprimir PDF en Mac?
On macOS, open the compressor in Safari, Chrome, or Firefox and drop your PDF into the page. The compression runs locally on the Mac's CPU using standard browser APIs, so there is no Mac app to install, no menu bar helper, and no upload to a server. The compressed PDF lands in your Mac's Downloads folder like any other file save. This is also a practical way to shrink a PDF on Mac without opening Preview, Automator, or a third-party desktop tool.
¿Puedo comprimir PDF sin conexión?
Yes. Load this page once with an active connection, then switch to airplane mode or disconnect your network — the PDF compression keeps working. All analysis and re-encoding happen in your browser, so after the initial page load the compressor does not need internet access to process files. This also serves as a direct demonstration that your PDF isn't being uploaded anywhere: if it were, offline compression wouldn't succeed.
¿Es segura la compresión PDF?
Yes — PDF compression is safe when it runs on your device instead of on a remote server. With this tool, the PDF never leaves your browser, so there is no upload log, no server retention window, and no third party that can read, replay, or leak the file. The compressed output is a standard PDF that opens in any PDF reader without risk. Endpoint hygiene still matters: keep your browser up to date and avoid running the compressor on a shared or untrusted machine.
¿Es gratis este compresor PDF?
Yes, this PDF compressor is free to use — compress PDF free, with no daily limit, no paywall, no signup, and no watermark on the compressed file. Because the compression runs in your browser, there is no server cost per job, which is why the free tier has no artificial caps. If you need images from the PDF instead,
PDF to JPG and
PDF to PNG are free under the same terms.
¿Puedo comprimir archivos PDF grandes?
Yes, you can compress large PDF files — the practical limit is your device's available memory rather than a server-side upload cap, because the entire compression runs in your browser. A few hundred scanned pages is typical on a modern laptop; for very long dossiers, compress in smaller ranges or pick a less aggressive mode. If you're assembling several PDFs into one before compressing,
merge them online first — the merge itself is also client-side.
¿Funciona en móvil?
Yes, the PDF compressor works on mobile — any modern browser on iOS (Safari, Chrome) or Android (Chrome, Firefox) can run the compression. Drop your PDF into the page, pick a mode, and the compressed PDF saves to your device's Downloads folder. Because everything happens in the mobile browser, there is no app to install and no account to create. Memory is tighter on phones than laptops, so for very long PDFs consider compressing in ranges.
¿Cuál es el mejor compresor PDF?
The best PDF compressor for most people is one that respects your document. A good PDF compressor should offer multiple compression modes, preserve text searchability when you pick the right mode, be free and watermark-free, and should not upload your file to a server. This compressor covers all four: compression runs entirely in your browser, four modes are available (Keep Text, Mixed, Scanned, Smallest), exports carry no branding, and there is no signup or paywall. Use it as a general-purpose PDF compressor whenever you need smaller files without handing the source over to a third party.
¿Cómo funciona la compresión PDF?
PDF compression reduces file size by re-encoding the image streams inside the PDF (usually the biggest contributor to size), lowering their resolution or increasing their JPEG compression level. Text and vector graphics are usually already well-compressed by the PDF format itself, so the largest savings come from scanned pages or photo-heavy content. In aggressive modes, the tool re-renders each page as a lower-DPI image and replaces the original — this flattens text but maximizes shrinkage. The PDF structure itself (fonts, metadata, object streams) is also tightened up as part of the rewrite.
¿Puedo comprimir PDF online de forma segura?
Yes — safety depends on where the work actually happens. Uploading your PDF to a remote server for processing means the file lives (even briefly) in infrastructure you can't audit. Running the job in-browser removes that risk entirely: the PDF bytes never leave your device, so there is no upload log, no retention window, and no third-party server that could be breached. Open DevTools → Network and verify for yourself that no request carries your file. Endpoint hygiene still matters — use a trusted device and keep your browser up to date.