PDF Too Large to Email? Make It Smaller Free
· 5 min read
Open a PDF compressor, choose a balanced setting, and download. For a scanned document that usually takes twenty-something megabytes under five. The pages become images, so text stops being selectable — on a scan it already was. If that is not enough, split the document rather than compressing further.
Thirty seconds, no software, and no uploading a confidential document to a stranger's server. Here is the short version.
On this page
The fast route
Open Compress PDF, drop the file in, choose Balanced, and download the result. For a scanned document that is usually enough to take it from twenty-something megabytes to under five.
If Balanced is not enough, Smallest file goes further. If even that is not enough, the document is probably better split into parts.
The three modes, and which one you want
The choice matters more than any other setting, because one of the three preserves your text and two of them do not. That is not a quality trade-off you can reverse afterwards.
| Mode | How it works | Text after | Typical saving on a scan |
|---|---|---|---|
| Keep text selectable | Re-optimises structure only | Preserved | A few percent |
| Balanced | Renders pages at 150 dpi | Becomes an image | Around 87% |
| Smallest file | Renders pages at 110 dpi | Becomes an image | Around 93% |
What Balanced actually does
It renders each page at 150 dpi and re-encodes it as a JPEG. 150 dpi is the point where printed output still looks clean and screen viewing is indistinguishable from the original.
Because the pages become images, the text stops being selectable. On a scan that was already true — a scan is a photograph of a page, and no text ever existed in the file. On a document exported from a word processor it is a real loss, and Keep text selectable exists for exactly that case.
The same applies to anything interactive. Links, bookmarks and form fields are page furniture that only survives while the page is still a page. Once it is an image, they are gone.
Choosing by what you are sending
The decision is easier framed by document than by setting. What matters is whether anyone downstream needs to search, copy from, or fill in the file.
- Scanned receipts, forms and signed paperwork: Balanced. Nothing is lost that was ever there.
- A contract someone will search or quote from: Keep text selectable, and split it if the size is still wrong.
- A form the recipient must fill in: Keep text selectable, always — rasterising destroys the fields.
- A photo-heavy brochure nobody will search: Smallest file.
Check the result before you send it
Open the compressed copy and look at one page at full zoom, not at the thumbnail. Compression artefacts are invisible at 30% and obvious at 100%, and the recipient will not be looking at a thumbnail.
If the document contains small print — footnotes, reference numbers, handwriting — check that specifically. It is the first thing to degrade and the most likely to matter.
When to stop compressing and do something else
If you are pushing to Smallest file and still over the limit, compressing further will visibly damage the pages before it gets you under. Split the document and send it in two messages, or upload it somewhere and send a link.
Compression is not a substitute for a file that is simply too large to email. A 200-page colour scan is a large object and will remain one.
Splitting has a practical advantage too: recipients rarely need all of it. Sending the four pages that matter is faster for you, smaller on the wire, and considerably more useful to the person reading it than a complete archive they have to search.
Before you compress a document you were sent
Check whether the sender still has the source. A PDF exported freshly from Word or Pages at a lower image quality will beat anything a compressor can do to the finished file, because it never embeds the oversized images in the first place.
That is worth one message. Compressing a PDF is always a repair job on a file that was built larger than it needed to be, and the person who built it can usually fix it at the source in seconds.
Common questions
Does compressing a PDF damage the text or content?
Keep text selectable leaves text, links and form fields intact, and saves correspondingly little. Balanced and Smallest file render each page to an image — that is what produces the large reductions, and it means text can no longer be selected or searched.
How small can a PDF be compressed?
It depends almost entirely on the contents. A scan typically drops 60–80% at Balanced and further at Smallest file. A text document exported from a word processor is already compact and may only shrink a few percent — there is little redundancy to remove.
Can I compress a password-protected PDF?
Not while it is encrypted. FileCrisp detects encryption before processing and rejects the file with a clear message rather than producing something broken. Remove the password in your PDF application first, then compress.
Will the compressed PDF open on any device?
Yes. The output is a standard PDF that opens in Acrobat, macOS Preview, Edge, mobile viewers and every browser. Nothing exotic is used that an older reader would choke on.
What if my PDF is still too large after compression?
Move from Balanced to Smallest file once. If that is still not enough, stop — further compression damages the pages before it meets the limit. Split the document, or send a link instead.
Is compressing PDFs on FileCrisp free?
Yes, with no account, quota or watermark. The compression runs in your browser rather than on a server, so there is no bandwidth bill to recover and no reason to meter it.
Does compressing a PDF remove its form fields?
In the rasterising modes, yes — a form field is an interactive object attached to a page, and it does not survive the page becoming a picture. Use Keep text selectable for anything that must remain fillable.