# Resize Image for AI Upload

> Shrink an image to the largest size ChatGPT, Claude or Gemini actually reads, so it uploads fast and wastes no tokens. Free, and nothing is uploaded.

Canonical: https://promptitin.com/free-tools/resize-image-for-ai
Last updated: 2026-11-13

AI models scale big images down anyway. Resize yours to the size each model reads, so it uploads faster, fits the file limits and keeps every detail the model can see.

This is an interactive tool. Use it at https://promptitin.com/free-tools/resize-image-for-ai.

## How to use it

1. Drop an image on the box, or tap to choose one.
2. Pick where you'll upload it: ChatGPT, Claude, Gemini or a custom size.
3. Choose the file type, or keep it the same.
4. Tap Resize, then Download.

## Tips

- Anything bigger than the model reads is wasted: it uploads slower and gets scaled down on the other side.
- For screenshots with small text, keep PNG so the letters stay sharp.
- For photos, JPG or WebP files are much smaller with no visible difference.
- Crop away what doesn't matter first, so the model spends its pixels on the part you care about.

## FAQ

### What size does ChatGPT read images at?

OpenAI's newest models read images at up to 2,048 px on each side and 2,500 patches of 32 px in high detail, according to OpenAI's vision docs (checked November 13, 2026). The ChatGPT option resizes to fit that.

### What is Claude's image size limit?

8,000 × 8,000 px and 10 MB per image. Claude 4.7 and later read up to 2,576 px on the long side and scale bigger images down. An image costs about ⌈width ÷ 28⌉ × ⌈height ÷ 28⌉ tokens, according to Anthropic's vision docs.

### What about Gemini?

Google doesn't state a size cap per image. Gemini reads large images in 768 px tiles, and one request can carry up to 20 MB of images inline. The Gemini option uses 1,536 px, which keeps detail at a modest token cost.

### Is my image uploaded?

No. It's resized on your device and never leaves it.

## Related

- [Aspect Ratio Cropper](https://promptitin.com/free-tools/image-aspect-ratio-cropper)
- [AI Token Counter](https://promptitin.com/free-tools/ai-token-counter)
- [AI Image Prompt Builder](https://promptitin.com/free-tools/ai-image-prompt-builder)