Will quality degrade?

High is lossless — visually identical. Medium re-encodes images at 150 dpi (still print-quality for most use cases). Low re-encodes at 72 dpi — fine on screen but visible softness when printed at full size.

Are my files uploaded anywhere?

High runs entirely in your browser — nothing uploaded. Medium and Low upload briefly so our server can re-encode images via Ghostscript; the file is processed and deleted immediately after you download.

Why didn't my PDF get smaller?

PDFs that are already well-optimized (exported from modern Word, generated by web tools, mostly text) don't have much slack. The tool never returns a larger file — if the chosen preset wouldn't shrink the input, you get the original back.

How do I shrink images without blurring the text?

Turn on "Recompress images only". It runs entirely in your browser, re-encodes the embedded JPEG photos at the quality you pick, and leaves every text and font stream completely untouched — so your text stays razor-sharp while the image-heavy pages get smaller. It only re-encodes JPEG (DeviceRGB/Gray) images; vector graphics and line art are left as-is.

Can I drop unused fonts and resources without losing quality?

Yes — pick the "Subset fonts + drop unused/duplicate resources" preset. It rebuilds the PDF on our server (Ghostscript), keeping only the font glyphs the document actually uses, discarding unreferenced/orphaned objects and unused images, and collapsing byte-identical images that repeat across pages into one shared copy. Images themselves are not re-compressed, so it's lossless for your content — ideal for trimming files that have leftover or duplicated resources.

Will quality degrade?

High is lossless — visually identical. Medium re-encodes images at 150 dpi (still print-quality for most use cases). Low re-encodes at 72 dpi — fine on screen but visible softness when printed at full size.

Are my files uploaded anywhere?

High runs entirely in your browser — nothing uploaded. Medium and Low upload briefly so our server can re-encode images via Ghostscript; the file is processed and deleted immediately after you download.

Why didn't my PDF get smaller?

PDFs that are already well-optimized (exported from modern Word, generated by web tools, mostly text) don't have much slack. The tool never returns a larger file — if the chosen preset wouldn't shrink the input, you get the original back.

How do I shrink images without blurring the text?

Turn on "Recompress images only". It runs entirely in your browser, re-encodes the embedded JPEG photos at the quality you pick, and leaves every text and font stream completely untouched — so your text stays razor-sharp while the image-heavy pages get smaller. It only re-encodes JPEG (DeviceRGB/Gray) images; vector graphics and line art are left as-is.

Can I drop unused fonts and resources without losing quality?

Yes — pick the "Subset fonts + drop unused/duplicate resources" preset. It rebuilds the PDF on our server (Ghostscript), keeping only the font glyphs the document actually uses, discarding unreferenced/orphaned objects and unused images, and collapsing byte-identical images that repeat across pages into one shared copy. Images themselves are not re-compressed, so it's lossless for your content — ideal for trimming files that have leftover or duplicated resources.

Compress PDF

Reduce a PDF's file size. Pick a quality preset — High keeps the file visually identical (lossless); Medium and Low re-encode images for much bigger savings.

1. Upload your file

Native PDFs convert in 10–60 seconds. Scanned PDFs use OCR and can take up to 3 minutes per 10 pages.

Drop a PDF file here

or click to browse

How does the Compress PDF work?

Reduce a PDF's file size by picking a quality preset. High keeps your file visually identical to the original (lossless — only metadata and duplicate objects are removed; 10-40% typical savings) and runs entirely in your browser. Medium re-encodes embedded images to 150 dpi, giving balanced quality with much bigger savings (often 50-80% on image-heavy PDFs). Low re-encodes images to 72 dpi for the smallest possible output (often 80-90% smaller) — great for email attachments or web sharing, but text-with-images may look softer. Medium and Low upload your file briefly so our server (Ghostscript) can re-encode the images; files are processed and deleted immediately. If the chosen preset cannot make the file smaller, the tool returns the original — it never produces a larger output.

🔒 Security & Privacy

Files are encrypted in transit and processed on a secure server. Your file is automatically deleted right after you download — we never store your documents.

📱 Use it on any device

Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.

⚡ Quick & easy

Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.

🎁 Always free, no signup

Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.

Frequently asked

For email attachments, Low usually wins — most receivers won't notice the image quality drop. For sharing with a client or printing, Medium is the safe middle. For archive copies you want pixel-perfect, use High.