PDF guides
The reasoning behind the tools. Why PDFs get so large, what compression actually throws away, whether uploading a document to a converter is safe, and how to get a decent scan out of a phone camera.
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Getting a document past a government portal upload limit
Why official forms impose 2 MB limits and strict page sizes, how to meet them without producing an unreadable file, and what to do when the limit is genuinely impossible.
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How to sign a document without a printer or a scanner
Electronic signatures, digital signatures and the print-sign-scan ritual: what each one actually is, which your recipient probably means, and when a drawn signature is legally enough.
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How to merge PDF files, and how to order them so they get read
Merging is easy. Merging well is about ordering, what survives the merge, and why the alphabetical sort in your file browser keeps putting page 10 after page 1.
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How to scan a document properly with a phone camera
A phone makes a good document scanner if you get four things right: light, angle, framing and settings. Here is how to produce a scan that gets accepted rather than returned.
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Why PDF files get so large, and what to do about it at the source
A three-page document should not be 40 MB. Here is where the bytes in a PDF actually go, how to find out what is inflating yours, and how to stop producing oversized files in the first place.
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Are online PDF tools safe? What happens to a file you upload
What actually happens when you upload a document to a free PDF converter, what the privacy policies really permit, and how to tell a browser-based tool from a server-based one.
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How to compress a PDF without wrecking the quality
What PDF compression actually throws away, how to decide between lossless and lossy, and the exact settings to hit a 2 MB upload limit while keeping the document readable.
What these guides are for
Every tool page on this site explains what that tool does. These guides exist for the questions that sit underneath: not "which button do I press" but "why is this file 40 MB in the first place", "what am I actually giving up when I compress this", and "is it safe to put a passport scan into a website I have never heard of".
Those questions matter because the wrong answer is expensive in a way that is not obvious at the time. Rasterising a contract to get it under an upload limit works, right up until someone needs to search it. Uploading a client file to a free converter is fine until you have to explain that you did. Numbering a document before you reorder it produces something worse than an unnumbered document. None of these mistakes announce themselves.
How they are written
Everything here is written by me, from doing the work rather than from summarising other articles. I build payroll and accounting software for organisations in Nepal, which means a steady diet of document packs for registrations, audits and grant applications — merging, splitting, compressing and chasing arbitrary portal limits. The guides are what I learned doing that, written down properly.
Where something is genuinely uncertain, or depends on your jurisdiction, or comes down to judgement, I say so rather than inventing a rule. Where a tool on this site has a real limitation, the guide states it — including where the honest answer is that you need desktop software or a lawyer rather than a web page.
If you find an error, tell me and I will correct it. Guides carry their published date, and an updated date when they have been revised.
Or just go and use a tool
The guides explain the reasoning. The tools do the work.