I spend an embarrassing amount of time dealing with PDFs, images, and documents. Not because I want to — because everyone around me needs help with this stuff. Family, friends, neighbors. “Can you merge these?” “Can you make this smaller?” “Why won’t this upload?”
Over the years I’ve picked up some things that save me time and headaches. Most of these I learned the hard way. Hopefully you don’t have to.
1. Always keep the original file
This sounds basic but I can’t tell you how many times someone has come to me with a compressed, cropped, converted image and asked me to “make it high quality again.” That’s not how it works. Once you compress a photo, the quality is gone. You can’t uncompress it.
Same with PDFs. If you merge documents and delete the originals, and then realize you merged them in the wrong order — you’re stuck.
I have a folder on my laptop called “originals” and everything goes there before I do anything to it. Saves me constantly.
2. Name your files properly
My dad saves everything as “document.pdf” or “scan.pdf” or “IMG_20260315_142756.jpg.” Then three months later he needs one specific file and we’re both sitting there opening 47 files called “document.pdf” trying to find the right one.
I started naming files like this: “cnic-front-faraz-2026.jpg” or “electricity-bill-march-2026.pdf.” Takes 5 extra seconds when saving. Saves 20 minutes when searching later.
Dates in filenames are a game changer. I always put the year and month. Future you will thank present you.
3. Compress before emailing
Most email services have a 25MB attachment limit. A single phone photo can be 4-5MB. A scanned PDF can be 8-10MB. Send 3-4 attachments and you’ve already hit the limit.
I compress everything before emailing now. Photos go from 4MB to 400KB. PDFs go from 8MB to 1-2MB. The recipient can’t tell the difference but the email goes through without bouncing.
A friend of mine kept getting “message too large” errors when emailing property documents to his lawyer. He was sending raw scans at full resolution. I compressed the PDF from 22MB to 3MB and it went through. He’d been trying for two days.
4. Don’t send sensitive files through random online tools
I wrote a whole separate post about this but it’s worth repeating. When you upload a file to most online PDF tools, your file goes to their server. For a photo of your cat, who cares. For your CNIC scan or bank statement? Think twice.
Use tools that process files in your browser — your files stay on your device. Or use the ConvertKr desktop app which works completely offline.
5. PDF is not always the best format
People convert everything to PDF like it’s some magic format. I’ve seen someone convert a single JPG photo to PDF before uploading it to a form that accepts JPG. Why? The form already takes JPG. You just made the file bigger for no reason.
PDF is great for documents with multiple pages, mixed content (text + images), and when you want the layout to stay exactly the same on every device. But for a single image, just send the image. For editable text, send the Word file. PDF makes sense when you need a fixed layout — not for everything.
6. Scan documents with your phone, not a scanner
Unless you work in an office with a proper flatbed scanner, your phone camera is actually better than those cheap portable scanners people buy. Modern phone cameras are 12-50MP. The built-in document scanning in iPhone and most Android phones automatically straightens the document, fixes the perspective, and increases contrast.
My method: place the document on a flat surface, make sure there’s good light (near a window works best), use the phone’s document scan mode, and crop if needed. The result looks as good as a proper scan.
One thing though — make sure you can see all four edges of the document in the frame. If the phone can’t detect the edges, the auto-straightening doesn’t work and you get a crooked scan.
7. Learn the difference between file size and page size
People mix these up all the time. File size is how much space it takes on your hard drive — measured in KB or MB. Page size is the physical dimensions — A4, Letter, etc.
When a form says “under 2MB” they mean file size. When they say “A4 format” they mean page size. When someone says “make this smaller” I always have to ask “smaller file size or smaller dimensions?” because the answer changes what I do.
Compressing reduces file size. Resizing or cropping reduces dimensions. Sometimes you need both. Sometimes just one.
8. WhatsApp destroys image quality
If someone sends you a photo over WhatsApp and you need to use it for anything important — printing, uploading to a portal, using on a website — ask them to send the original through email or Google Drive instead.
WhatsApp compresses every image heavily. A 4MB photo becomes like 100KB. Fine for chatting, terrible for anything else. I’ve had people send me their CNIC photo over WhatsApp and then wonder why it looks blurry when they try to zoom in. Because WhatsApp crushed the quality.
Same goes for documents. If you send a PDF over WhatsApp, the quality stays fine because WhatsApp doesn’t recompress PDFs. But images? Destroyed.
9. Merge first, then add page numbers
If you’re combining multiple documents into one PDF, add page numbers AFTER merging. Not before. I’ve seen people number each individual document 1-10, 1-15, 1-8, then merge them. Now the combined document has three “page 1″s and the numbering makes no sense.
Merge everything first. Then add page numbers to the combined document. Clean sequential numbering from 1 to whatever.
My uncle learned this the hard way when he combined his notes from three different files and the page references in his table of contents were all wrong.
10. Back up your important documents somewhere
Not on your phone only. Phones break, get stolen, fall in water. Not on one laptop only. Hard drives die.
I keep important documents in three places: my laptop, a USB drive in my drawer, and Google Drive. My dad lost his phone last year with all his scanned documents on it. I had backups of everything because I’d uploaded them to Drive after scanning. He was so relieved.
Doesn’t have to be fancy. Just email important scans to yourself. Or put them in a Google Drive folder. Takes 2 minutes and saves you from disaster later.
The point of all this
None of these tips are complicated. Most take less than a minute. But they save hours of frustration down the line. I learned all of them because I or someone I know messed something up first. Deleted an original, sent a huge email that bounced, uploaded a CNIC to a sketchy website, sent a WhatsApp photo for printing and it came out blurry.
If even one of these saves you from a headache, I’m happy. And if you need tools for any of this stuff — merging, compressing, converting, cropping — ConvertKr does all of it free, right in your browser.