Why a phone photo is already too big
A modern phone camera produces images in the 12–48 megapixel range, and a photo of a document — even a simple one-page letter — is commonly 2 to 5 MB straight off the camera. None of that size is wasted on purpose; it's just far more resolution and colour depth than a page of text or a signature needs once it's inside a PDF. A 200 KB target means cutting that down by roughly 95 to 99 percent.
Step 1: Combine the photos into one PDF
Image to PDF places each photo onto its own page, one page per photo, in the order you add them. It is the right move whenever more than one photo needs to travel together and arrive in order — a form with a front and back of an ID, or a multi-page letter photographed one page at a time.
One thing to know: the tool places images as they are, without recompressing them first, so the resulting PDF is roughly as large as the photos combined. Ten uncompressed phone photos can produce a 30–40 MB file before any compression step. That's expected — the size reduction happens in the next step, not here.
Step 2: Hit the exact KB with a target-size pass
Compress to target size takes the combined PDF and searches for the resolution that fits the number you type in, trying values between 30 and 200 dpi before reducing JPG quality further if needed. Type a figure a little below the real limit — 190 KB rather than 200 — because kilobyte can mean 1,000 or 1,024 bytes depending on who's counting, and the margin avoids a rejection over a rounding difference.
Worth knowing: this now runs directly in your browser, with no daily limit — the file never has to leave your device. (A server-side mode is still available if you prefer it for a particular file.) If you'd rather not type in a target yourself, Compress does a similar re-encoding using fixed levels (Low, Medium, High, Extreme), each setting a maximum page width and a JPG quality. It won't land on an exact KB figure the way the target-size tool does, but it's a reasonable first try.
Watch the orientation before you combine
Phone cameras often save a photo the right way up but with a rotation flag in the file rather than actually rotating the pixels — most viewers correct for this automatically, but some PDF tools render the flag literally and the page comes out sideways. Check each photo's orientation before adding it, and fix any sideways pages afterward with Rotate & reorder rather than retaking the photo.
Multiple photos share the same budget
Just like with scanned pages, a 200 KB limit is divided across however many photos went into the file:
| Photos combined | Budget per page |
|---|---|
| 1 | 200 KB |
| 2 | 100 KB |
| 3 | 65 KB |
| 5 | 40 KB |
A single ID photo fits comfortably. Five photographed pages at 40 KB each will be legible for large print but tight for anything with small text — crop out anything that isn't the document itself (borders of the table it's resting on, your hand holding the page) before combining, since every pixel in the frame competes for the same budget.
If the photo itself is the thing being judged
Some of what people photograph for upload isn't a document at all — it's a passport-style photo or a signature, and the form wants that specific image, not a scanned letter. PDF vs image: which should you upload covers when a form actually wants a plain image file rather than a PDF wrapper. If your form wants a JPG and not a PDF, pdf300 doesn't currently have a standalone "resize this one photo to an exact KB" tool. A workaround that uses what's already here: build a one-page PDF with Image to PDF, compress it to your target with Compress to target size, then export that single page back out as a JPG at a resolution you choose with PDF to Image. It's two extra steps, not a dedicated tool.
Checking the result
Open the final file and zoom in on the smallest text or the signature, if there is one. At 40–65 KB per page, stamps and faint ink are usually the first details to go — check those specifically. If a particular page fails but the others are fine, it may be worth photographing just that page again with less background in the frame, rather than lowering the overall target further.
Quick checklist
- Crop out everything in the photo that isn't the document.
- Combine with Image to PDF in the order the form expects.
- Compress to a number slightly under the stated limit with Compress to target size.
- Divide the limit by the number of photos before judging whether it's realistic.
- If the form wants a plain image, not a PDF, export the compressed page back out with PDF to Image.