A friend texted me on a Sunday night, half-panicking. She was applying for a flat, and the rental portal wanted her last three payslips as one PDF — under 2 MB. Hers was nine. She'd already found a "compress PDF" site, uploaded the file, and was watching the progress bar when she stopped and asked: "this is fine, right? it's got my salary and my account number on it."
It isn't, really — not a disaster every time, but not something I'd do with a payslip. And it's such a common trap, because the documents too big to email are almost always the ones you'd least want sitting on a stranger's server: payslips, bank statements, a scanned signed contract, ID proofs. Uploading those to the first search result is precisely the wrong instinct.
So here's how I deal with it instead, and why.
Why these are the PDFs that bounce
A bank statement is a few kilobytes of text wrapped around a logo and, if you scanned or photographed it, full pages saved as phone-camera-resolution images. The words weigh almost nothing; the pictures are the whole problem. That's also the good news — bring the images down to a sane size and the file drops hard while the text stays exactly as it was.
What the email limit actually is
The error messages are vague, so a quick reality check. Gmail caps attachments at 25 MB. Outlook.com is lower, around 20 MB. And there's a catch nobody mentions: attachments are re-encoded for transit and travel about a third larger than the file sitting on your disk, so a 20 MB PDF can trip a 25 MB limit. Plenty of company mail servers also quietly cap what they'll accept. Treat "under 25 MB" as "comfortably under 20."
Shrink it without uploading it
Here's the part that matters for a payslip: you don't have to send it anywhere to make it smaller. ToolsTray's Compress PDF does the whole thing in your browser — it opens the file on your device, re-encodes the images inside it, and rebuilds a lighter copy locally. Nothing leaves the tab. Drop the file in, choose Balanced, download. The text stays sharp and selectable because only the images are touched — which is exactly what separates it from tools that "compress" a PDF by flattening every page into a single picture.
When the form wants 100 KB, not 25 MB
The nastier version is the government form or job portal with a hard ceiling — 200 KB, sometimes 100 KB. I built the Target size option for exactly that, after a form rejected a scan of mine for being 240 KB without so much as hinting how far over the line I was. You type the limit; it keeps trying stronger compression until it finds the lightest result that still fits — or tells you the smallest it managed, if the file simply can't get there.
Why "in your browser" isn't just a slogan here
For a meme PDF, who cares where it gets compressed. For a document with your salary, account number, and home address on it, that's the entire question. A file you upload sits on someone else's server, in their logs, under their privacy policy, for however long they keep it. Processed on your device, there's nothing to leak — it never crosses the network.
When compressing won't help — and what to do instead
Honestly, it won't rescue every file. A PDF that's mostly text — a plain letter, a generated invoice — has almost no image data to drop, so it'll barely move, and the tool tells you so rather than pretend. (It also never hands you a file bigger than the one you started with.) If you're still over the limit, split it and send two emails, or rebuild it from fewer pages. And yes — a heavy cloud service with aggressive downsampling might squeeze out a little more than an on-device tool can. For a bank statement, that's not a trade I'd make.
My friend's payslips went from nine megabytes to about six hundred kilobytes in a few seconds, never left her laptop, and the portal took them on the first try. That's the bar I aim for: small enough to send, private enough to stop thinking about.
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