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).
Related tools
Browse allOverlay UI safe-area guides for Instagram, YouTube and TikTok.
Change dimensions with high-quality resampling.
Crop with aspect-ratio presets — square, 16:9, portrait, freeform.
Per-platform compression presets for IG, YouTube, X, LinkedIn, WhatsApp.
Frequently asked questions
Are my files uploaded to a server?
No. Every tool on SnapToolz runs entirely inside your browser using JavaScript and WebAssembly. Your file is read locally, processed in memory, and the result is offered as a download. Nothing is sent to a server — there isn't one to send to.
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.
Does it work offline?
Yes. SnapToolz is a Progressive Web App. After your first visit, the app is cached on your device and every tool keeps working without an internet connection.
Is SnapToolz free?
Yes — every tool is 100% free with no sign-up, no watermark, no hidden tier. The whole platform is open source and we have no plan to gate features.