Aspect Ratio Crop — Pixel-Perfect Crops for Every Platform
Every social platform wants a different shape. Instagram likes 1:1 and 4:5. YouTube wants 16:9 thumbnails. Reels and TikTok demand 9:16. Pinterest favours 2:3. Crop wrong and the platform will silently chop your image — usually right through the most important part. This tool locks the crop box to the exact ratio you need so what you see is exactly what gets uploaded.
What is the Aspect Ratio Crop — Instagram, YouTube, TikTok Presets?
An aspect-ratio crop tool with locked-ratio presets for every major social platform plus print formats and a custom ratio option. The crop box can be moved and resized freely while preserving the chosen ratio, with a rule-of-thirds overlay for composition.
Key features
- Presets for Instagram, Reels, YouTube, TikTok, Pinterest, Facebook, and Twitter
- Print presets — 6×4 (3:2), 8×10 (5:4), and 21:9 cinematic
- Custom ratio input for non-standard requirements
- Locked-ratio resize handles — crop box cannot drift off-ratio
- Rule-of-thirds composition grid
- Live pixel dimensions readout
- Original-resolution export — no downscaling
- 100% browser-side — no uploads
How it works
When you pick a preset, the crop box snaps to the largest possible region that fits the chosen ratio. Resizing any corner recomputes the opposite dimension to preserve the ratio exactly. On export, the source image is drawn into a new canvas at the cropped pixel coordinates and encoded as PNG (if the source was PNG) or JPG at high quality.
Why use this tool
Cropping in image viewers and basic editors usually means eyeballing the ratio — and getting it wrong by a few pixels is enough for the platform to recompress and recrop your work. Ratio-locked cropping eliminates the guesswork entirely.
Common use cases
- Cropping product photos to 1:1 for Instagram feed posts
- Preparing 9:16 vertical video thumbnails for Reels and TikTok
- Generating 16:9 YouTube thumbnails from horizontal photos
- Cropping portraits to 4:5 for the Instagram feed (taller = more screen space)
- Sizing photos to 2:3 for Pinterest pins
- Preparing 6×4 prints from DSLR images (which are 3:2 natively)
How to use this tool
- Upload Your Image — Drop in any JPG, PNG, or WebP — handled entirely in your browser.
- Pick a Preset — 1:1 for Instagram, 9:16 for Reels, 16:9 for YouTube, or set a custom ratio.
- Drag to Position — Move the crop box and resize the corners — the ratio stays locked.
- Download — Export the cropped image at original resolution.
Who should use this
Social media managers preparing posts for multiple platforms. Photographers cropping for print. Content creators making thumbnails. E-commerce sellers preparing product shots. Anyone who has ever uploaded an image only to see it cropped badly.
How to get started
Upload your image, pick the preset for your target platform, drag the crop box where you want it, and download.
Best practices
- Place key subjects on rule-of-thirds intersections, not dead centre
- Crop tighter than feels right — social feeds are small
- For print, match the paper ratio exactly to avoid lab auto-crop
- Keep important detail away from the crop edges (platforms add UI overlays)
Pro tips
- Use the rule-of-thirds grid to place subjects on intersections for stronger composition.
- 9:16 is the safest crop for Stories, Reels, TikTok, and YouTube Shorts.
- When cropping for print, match the paper ratio (3:2 for 6×4, 5:4 for 8×10) to avoid lab cropping.
Expert insights
💡 The 4:5 Trick
On Instagram, 4:5 portrait posts take roughly 25% more screen space than 1:1 squares while still appearing 'native'. Use 4:5 whenever the subject is vertical.
⚡ Locked vs Free
Pick 'Freeform' only when you genuinely don't care about aspect ratio. For anything destined for upload, locking saves you from silent platform recropping.
✓ Safe Zones
On Stories and Reels, keep important elements at least 250px away from the top and bottom edges — that's where the UI lives.
Limitations to be aware of
- Single image at a time — not a batch tool
- Cannot rotate or straighten during crop (use the rotate tool first)
- Maximum source size: 50MB
Frequently asked questions
- Which aspect ratio should I use for Instagram?
- 1:1 for square feed posts, 4:5 for portrait feed posts (which take more vertical space and perform better), and 9:16 for Stories and Reels.
- Will the image be downscaled?
- No. The crop is applied at the original resolution — only the area outside the box is removed.
- Can I crop to a custom ratio?
- Yes — use the Custom Ratio inputs to enter any width:height pair.
- Does this upload my image?
- No. Cropping is performed entirely in your browser using the Canvas API. Nothing is uploaded.
- What output format do I get?
- PNG inputs export as PNG (preserving transparency); everything else exports as JPG at 95% quality.
- Why is the crop box locked when I pick a preset?
- Locking the ratio is the entire point — it guarantees the export matches your target platform exactly. Switch to Freeform if you want unrestricted cropping.
- Can I crop multiple images at once?
- Not in this tool — the aspect crop tool is single-image so the crop box can be positioned precisely.
- What's the maximum file size?
- Up to 50MB. Very large images may take a moment to render the preview.