Common Image File Problems and How to Fix Them
Won't upload, too large, wrong format, won't open — a quick troubleshooting guide for the image errors people run into most.
Most image problems people run into fall into a handful of repeat categories. Here's what's usually actually going on, and the fastest fix for each.
"File won't upload" or "unsupported format"
Almost always a format problem. The most common cause is a HEIC photo from an iPhone being uploaded somewhere that only accepts JPG or PNG. Convert it to JPG first — see the full HEIC guide if this keeps happening. Less commonly, it's a file that's technically corrupted; re-exporting or re-saving the image from its source usually fixes that.
"File too large"
Most upload forms cap file size, commonly between 2MB and 10MB. Modern phone cameras routinely produce 3-5MB photos, which can already exceed some limits. Compress the image — a moderate compression pass usually cuts file size by 70-90% with no visible quality difference at normal viewing size.
Image looks stretched or distorted
This happens when width and height were resized independently instead of proportionally. It's almost always a resizing mistake rather than a camera or file problem — see our resizing mistakes guide for how to avoid it going forward. There's no way to "un-stretch" an already-distorted image without the original — always resize from the original file.
Image looks blurry after resizing
Usually caused by upscaling — making a small image larger than its original resolution. Software can smooth the result, but it can't invent detail that wasn't captured in the original photo. The only real fix is starting from a higher-resolution original, or accepting the image will only look sharp at its original size or smaller.
Colors look different after saving or converting
Usually a color profile mismatch — some editing software embeds a color profile that not every viewer interprets the same way, leading to slightly shifted colors between apps. Converting to a standard format like JPG or WebP with a standard color profile usually resolves it for normal web and sharing use.
"Nothing uploads, ever" on a slow connection
If this happens consistently, it's very likely file size combined with connection speed, not a broken upload form. See our guide on compressing images on a limited data bundle — resizing and compressing before upload usually turns a failing upload into an instant one.