Fit each platform perfectly. Pick recommended sizes for Instagram, YouTube thumbnails, X headers and more, in one go.
Click to choose a file Drag an image here
JPG, PNG, WebP, HEIC, etc.
How to use it
- 1Drag in a JPG, PNG, or WebP image, or click to upload it.
- 2Pick a platform (Instagram, YouTube, X, Facebook, LinkedIn, and more), then choose the size you need within it.
- 3Drag the frame to set which part is kept. The frame stays locked to the chosen spec’s ratio.
- 4Choose the format to save in (JPG, PNG, or WebP) and hit Convert.
- 5Check the result preview and download to save — that’s it!
Handy tips
- Pick the platform first, then the size — so even within Instagram you can switch between square, portrait (4:5), and story (9:16) on the fly.
- The frame’s ratio is locked, so the photo never stretches or squashes. Just drag to frame the part you want.
- People or text right at the edges can get clipped, so leave a little margin inside the frame around anything important.
Recommended sizes, platform by platform
The tool ships the common sizes for each platform as presets. Instagram covers the square post at 1080×1080, the portrait post (4:5) at 1080×1350, and stories/reels (9:16) at 1080×1920. YouTube offers the thumbnail (16:9) at 1280×720 and channel art at 2560×1440, while X (Twitter) includes a post image at 1600×900 and a header at 1500×500.
Facebook gives you the post at 1200×630 and the cover at 851×315, LinkedIn a post at 1200×627, KakaoTalk the link preview (OG) at 800×400, and Naver Blog a hero image at 800×800. Each is named for where it goes — square, portrait, thumbnail, cover, header — so you pick the slot you need and it fits to exactly those pixels.
Why the ratio-locked frame matters
Most social specs come with a fixed aspect ratio — 1:1 for an Instagram square, 16:9 for a YouTube thumbnail, 9:16 for a story. Just forcing the dimensions bigger would spread the photo sideways or squash it top to bottom and look off, but this tool locks the frame to that ratio so it can't happen.
Instead, all you decide is which part to keep, by dragging. Move and resize the frame to place the subject where you want it, and the parts outside get trimmed cleanly while what's inside is saved at the spec's exact pixels. It structurally prevents the common mistake of stretching a photo to a mismatched ratio.
Reducing quality loss after upload
Social platforms re-compress every image you post on their own servers. Upload smaller than the spec and it gets stretched and blurred; upload far too large and it can get over-compressed and grainy instead. Matching the preset size (say, Instagram square at 1080×1080) is the shortest path to a clean-looking result.
For the save format, JPG suits photos, while PNG helps for logos or images with crisp text. Text-heavy thumbnails easily get messy around the letters when JPG compresses them hard, so consider PNG there. Checking the result in the preview before you upload lets you catch any unexpected softness early.
Frequently asked questions
No, your original stays as is. You just download a new copy fit to the social spec, so there’s nothing to worry about. And since everything runs in your browser, the original never leaves your device.
It includes specs for Instagram, YouTube, X (Twitter), Facebook, LinkedIn, KakaoTalk, and Naver Blog. For each platform you can pick common sizes like square, portrait, thumbnail, cover, and header.
You can upload JPG, PNG, and WebP, and choose any of them when saving.
Hit “Adjust again” on the result screen to reset the frame. You can also switch the platform or size to fit a different spec right away.
For a specific pixel size that's not in the list, use the Resize tool and type the width and height directly. If you only need to fix a ratio and crop freely, use the Crop tool — and lean on these presets for the common social specs. Splitting the work that way keeps things quick.
The presets are set to each platform's current recommended sizes, but social specs do change now and then. If the size shown on the upload screen differs, make the exact pixels you need in the Resize tool to match the latest value. Most specs keep the same ratio, so the presets still fit well even so.