AM A PDF that is too big to email or too big for an upload form is usually big for one reason: images. Scanned pages, photos and high-resolution graphics make up most of the weight in most large PDFs. This tool gives you two ways to shrink a file and shows the size before and after, so you can decide whether the result is worth keeping.
Compression runs in your browser. The PDF is not uploaded, and the result has no watermark.
How to compress a PDF
- Drag the PDF into the box at the top of this page, or click it to choose the file.
- Choose a mode. Start with Standard if you need to keep text selectable. Choose Strong for scans and image-heavy files.
- In Strong mode, set the image quality. Lower quality gives a smaller file.
- Click compress and wait while your device processes each page.
- Compare the original size with the new size.
- Open the compressed file and read the smallest text on a page at 100 percent zoom. If it is fuzzy, raise the quality and try again.
- Download the result, or keep the original if the saving is too small to matter.
Standard vs Strong compression
| Standard | Strong | |
|---|---|---|
| How it works | Lossless cleanup of the file's internal structure | Renders each page as an optimized JPEG image at the quality you choose |
| Text selectable and searchable | Yes | No |
| Visual quality | Unchanged | Depends on the quality setting |
| Typical saving | Modest | Large for scans and photo-heavy files |
| Links and form fields | Kept | Lost, because each page becomes a picture |
| Best for | Contracts, reports, anything people will search or copy from | Scanned documents, photo reports, files that only need to be read |
Standard mode does not change what you see. It tidies the file itself, which can trim some size from PDFs that were edited and saved many times or exported by software that does not optimize its output. Strong mode rebuilds the document from pictures of its pages. For a scan, the pages were pictures anyway, so little is lost and the saving can be large. For a text document, you lose the ability to select, search and copy the text.
When compression barely helps
It is better to know this before you spend time on it. Compression has little effect when:
- The PDF is mostly text. A report exported from Word or Google Docs is often already small. Standard mode may save only a few percent.
- The file was already compressed. Scanner apps and many online services already optimize their output. Squeezing it again gives little back.
- You use Strong mode on a text document. A picture of a page can be larger than the text it shows, so the file may even grow. The tool shows both sizes so you can see this and keep the original.
- The weight comes from fonts or attachments. Embedded fonts and files attached inside the PDF are not the kind of content page images replace.
If a portal limits the size of each upload, splitting may work better than compressing. Split PDF can divide a long document into parts that each fit the limit, with no loss of quality.
Tips for smaller PDFs
- Keep the original. Strong mode cannot be undone on the compressed copy. Once a page is an image, the text is gone from that file.
- Fix the source when you can. If you build a PDF from photos, shrink the photos first with the image resizer, then combine them with JPG to PDF. That beats compressing a huge file after the fact.
- Compress after merging. If you are bundling several files with Merge PDF, merge first and compress the finished file once.
- Know the email limit. Gmail attachments are limited to 25 MB. Aim well below the limit your recipient's mail system uses.
- Use Standard for anything you publish. Spec sheets, size charts and guides on a website should keep real text, so search engines and screen readers can read them and visitors can copy details.
PDFs on a website
Store owners and site builders often attach PDFs for size charts, care instructions or buyer's guides. Keep them small, since many visitors open them on a phone connection. For content you want to rank in search, a normal web page usually serves readers better than a PDF: it loads faster, reads well on a small screen and can carry structured data. That is the approach the AI Site Builder in AM Jarvis takes, publishing pillar and cluster pages as regular HTML.
Privacy and limits
All compression happens in your browser. The PDF is processed on your own device and never uploaded to a server, and the tool keeps working offline once the page has loaded. That makes it safe for tax documents, medical records and signed contracts.
The tool is free with no daily limit, needs no sign-up and adds no watermark. Strong mode draws every page as an image, which takes memory. Very large files, in the hundreds of megabytes, depend on how much memory your device has, and long documents compress faster on a computer than on a phone.
Password-protected (encrypted) PDFs must first be opened with their password in another app and saved as an unprotected copy, if you have permission. This tool does not remove passwords or restrictions.