About Story Aspect Ratio Converter
Different platforms expect different aspect ratios — square for Instagram posts, 9:16 for Stories and Reels, 16:9 for YouTube and X, 1.91:1 for Facebook and LinkedIn. The Aspect Ratio Converter takes any image and renders it to the platform of your choice, with three fit modes: cover (crop), contain (pad with solid colour), or blur fill (pad with a blurred oversized copy of the source). All ten preset sizes are listed, grouped by platform.
- No uploads
- Browser-only
- Works offline
- 100% free
How it works
- 1
Drop your image
Any modern image format. The source aspect doesn't matter — pick a target and let the tool fit.
- 2
Choose target preset
Grouped by platform — YouTube, Instagram, TikTok, X, Facebook, LinkedIn. Each shows the exact pixel size.
- 3
Pick fit mode
Cover for matching-orientation sources, contain for explicit padding, blur fill for portrait → landscape (or vice versa).
Cover, contain, or blur-fill — three ways to change a ratio
Changing an image's aspect ratio always means resolving a mismatch: your source is one shape, the target slot is another, and something has to give. There are exactly three honest options, and picking the wrong one is the difference between a polished post and an obviously-mangled one.
Cover (crop to fill) scales the image until it fills the frame and trims the overflow — no bars, but you lose whatever falls outside the new shape, so a tall portrait cropped to 16:9 can decapitate the subject. Contain (fit with bars) shrinks the whole image inside the frame and pads the gaps with a solid colour — nothing is lost, but you get letterbox bars. Blur-fill is the modern compromise: it fits the full image and fills the surrounding space with a blurred, enlarged copy of itself, so the frame is full and nothing is cropped — ideal for putting a landscape photo into a 9:16 Story without black bars or lost content.
Target ratios by platform slot
There is no single 'social media size'. Each surface has a native ratio, and posting the wrong one means the platform crops you automatically — usually badly. Match the slot before you publish.
| Ratio | Orientation | Typical use |
|---|---|---|
| 1:1 | Square | Feed posts, profile-grid uniformity, ad creative |
| 4:5 | Portrait | The tallest feed post Instagram allows — maximises feed real estate |
| 9:16 | Vertical full-screen | Stories, Reels, Shorts, TikTok |
| 16:9 | Landscape | YouTube, X/Twitter, LinkedIn link previews, desktop video |
| 2:1 | Wide landscape | X in-stream images, blog headers, OG share cards |
When in doubt for the main feed, 4:5 portrait takes up the most vertical space and tends to out-perform square for reach.
Batch the boring part, and avoid the squish
- The cardinal mistake is stretching: forcing a 16:9 image into a 1:1 box by distorting it makes faces wide and circles oval. Cover, contain, and blur-fill all preserve proportions — none of them stretch. If something looks squished, you used a stretch tool, not this one.
- Re-cropping a low-res image to a taller ratio throws away pixels you can't get back. Start from the largest original you have, not a downloaded thumbnail.
- Producing one master, then several ratios, is the efficient workflow: shoot or design once, then batch-convert to 1:1, 4:5 and 9:16 for cross-posting in one pass instead of re-editing per platform.
- Once cropped, hit the platform's file ceiling with the Social Compression Toolkit, or do straightforward dimension changes with Resize Image.
Frequently asked questions about Story Aspect Ratio Converter
Why blur fill?
When you have a portrait video / image and need to post it as a horizontal thumbnail (or vice versa), bare letterboxing looks unfinished. Blur fill duplicates the source as a softened, oversized background and centres the original on top — same effect TikTok and YouTube use natively for off-aspect content.
Can I add custom dimensions?
Not directly in this tool — it focuses on platform-correct presets to keep the UI focused. For arbitrary dimensions use the Image Resize tool.
Privacy, offline use, browser support, and pricing questions are answered on the site-wide FAQ.