The Best Free PDF Compressors, Honestly Compared

Your PDF is too big for the thing you need to send it to, and you'd like it to be smaller by lunchtime. That's the whole problem. But "best free PDF compressor" turns up a dozen tools that all promise the same 80% reduction, and the differences only show up after you've used them. This is a Smallpdf vs iLovePDF comparison with a third option in the mix — MyTools — and it includes the trade-off most compression articles skip: what actually happens to your document when a tool makes it small.

What a PDF Compressor Actually Does

Almost all the weight in a big PDF is images. A ten-page text document is maybe 200 KB; the same ten pages scanned on a phone are 40 MB. Compression works by making those images smaller — fewer pixels, more aggressive JPEG quality — and leaving the rest of the file alone.

That's where the tools quietly diverge. Some compressors re-encode only the embedded images and leave the page structure intact, so your text stays real text. Others rasterize the whole page — they photograph each page and rebuild the PDF out of those pictures. Both make the file smaller. Only one of them lets you still search the document afterwards.

The problems that send people looking in the first place are specific:

• Attachment limits. Gmail bounces anything over 25 MB, and plenty of corporate mail servers stop at 10 MB.
• Upload portals. Visa applications, job boards, and tax filings routinely cap uploads at 5 MB, and they don't negotiate.
• Scans. A phone scanner produces beautiful, enormous files. A 60-invoice year becomes a 240 MB folder.

And people reach for a browser tab rather than desktop software because this is a one-off. Nobody wants to install Acrobat to email a proposal once.

Smallpdf

Smallpdf is a Swiss freemium PDF suite with a compressor that's part of a much larger toolbox. It's aimed at people who want a polished interface and will tolerate a paywall.

What it gets right

• The interface is the most refined of the three — clear, quiet, and hard to misuse.
• Compression preserves the document's text layer, so the output stays selectable and searchable.
• It compresses to a target size (getting a file under 1 MB or 300 KB is a documented workflow, not guesswork).

Where it falls short

• The free tier is the tightest here: reports point to roughly two compressions per day before you hit an upgrade prompt.
• "Strong" compression is a Pro feature. Free users get basic compression, which typically lands around 20–40% reduction — respectable, but not the 80% the marketing implies.
• Your file is uploaded to Smallpdf's servers (hosted on AWS in the EU) and deleted within about an hour of processing.

iLovePDF

iLovePDF covers similar ground with a broader free allowance. It's the more generous of the two suites for casual use.

What it gets right

• No daily task cap on the free tier — compress as many files as you like, without registration.
• Three compression levels (Extreme, Recommended, Less), so you choose the quality trade-off rather than paying for it.
• Files up to 100 MB on the free tier, plus desktop and mobile apps if you outgrow the browser.

Where it falls short

• Files are uploaded and held on iLovePDF's servers for up to two hours before deletion.
• The free experience carries ads and upgrade prompts; premium runs around $9/month.
• Compression quality at the Extreme setting can be unpredictable across very different documents — you may need a second pass to find the level you want.

MyTools

MyTools takes a different technical route: the compression runs inside your browser using your own machine's CPU. Nothing is uploaded. It's free, with no account and no daily ceiling — but the method has a real cost, and it's worth understanding before you pick it.

What it gets right

• Your PDF never leaves your device. For a bank statement, a medical record, or a signed contract, there's no server copy to trust or delete, because one was never made.
• Free with no wall. No two-a-day limit, no signup, no email, no watermark. Drop in 60 invoices, compress them all, download a single ZIP.
• Three levels (Screen, Recommended, Print), and every result shows its original size, new size, and exact percentage saved before you download.

Where it falls short

• It rasterizes. Each page is re-rendered as a JPEG, so text in the compressed file is no longer selectable, copyable, or searchable — it's a picture of text. For a scan that was already an image, you lose nothing. For a text PDF you'll need to search later, this is the wrong tool, and Smallpdf or iLovePDF are the better call.
• Text-heavy PDFs barely shrink. Text is already compact; rasterizing it can even make the file bigger (the tool detects this and hands back your original). The dramatic savings come from image-heavy documents, not reports.
• No target-size mode — you can't ask for "under 1 MB" and have it work backwards. You pick a level and see what you get.
• Very large files lean on browser memory; a 150 MB PDF on an old phone will struggle where a server farm wouldn't.

At a Glance

	Smallpdf	iLovePDF	MyTools
Free daily limit	~2 compressions/day	None reported	None
Free file size limit	~100 MB	100 MB	~200 MB (device-bound)
Strongest compression	Pro only	Free	Free
Files uploaded to server	Yes (deleted ~1h)	Yes (deleted ~2h)	No — runs in browser
Text stays searchable	Yes	Yes	No — pages are rasterized
Best for	Polish and target sizes	Everyday free volume	Private, image-heavy files

Which One Should You Pick?

If your PDF is a scan — receipts, invoices, signed pages, anything that was already photographed — MyTools is the strongest fit. The text was never searchable to begin with, so rasterizing costs you nothing, and you get the biggest reductions, no daily cap, and no upload.

If your PDF is a real document you'll want to search, quote, or copy from later — a report, a contract, a thesis — use iLovePDF. It keeps the text layer intact, its free tier has no daily wall, and it gives you the aggressive compression setting without a subscription.

If you need a specific number — the portal says 1 MB and only 1 MB will do — Smallpdf's target-size workflow is worth the two-a-day limit, or the Pro plan if you do this often.

And if the file is sensitive, the calculus shifts. Both suites are reputable and delete files on a clear schedule, but that's still a copy of your bank statement on someone else's server for an hour. Local processing doesn't ask you to trust anyone.

The Bottom Line

There's no single winner, and any article that tells you otherwise hasn't tested the same PDF three ways. The suites keep your text real and give you precision; MyTools gives you privacy, no limits, and the best results on the scanned files most people are actually trying to shrink.

If your file is a scan and you'd rather not upload it, compress it in your browser instead →