Checked against the source
Threads post image size
Short answer
This site uses 1080 × 1350 pixels (4:5) for a Threads post image. The Threads documentation we could read does not state a fixed size, so treat it as a working size.
Key takeaways
- We found no official Threads page that gives a post image size; third-party guides say any dimensions are accepted.
- 1080 × 1350 is the 4:5 frame also used for Instagram portrait posts (computed).
- A square photo keeps 80% of its area in 4:5 and a 16:9 photo keeps 45% (computed).
- Across our six test pictures the 1080 × 1350 result was 229 KB to 444 KB as a JPG at quality 0.92.
The size
| What | Value |
|---|---|
| Width | 1080 px |
| Height | 1350 px |
| Aspect ratio | 4:5 |
Reported by third parties
Reported by third parties; The Telegram core documentation we read on 2026-10-07 gives no channel avatar figure.
| What | Reported value | Source |
|---|---|---|
| Post image | any dimensions | BUF |
| Profile photo | 320 x 320 px | BUF |
Source keys: BUF = Buffer: Social Media Image Sizes in 2026 (2026-05-12)
Resize it now
Scales and center-crops any image to exactly 1080 x 1350 px, in your browser. Nothing is uploaded, there is no file size cap and no daily limit.
Batch is unlimited and free - every image is processed on your device, so there is no queue and no daily cap.
What a 1080 × 1350 frame does to common photo shapes
The frame is 4:5. A photo of another shape is scaled until it covers the frame and the excess is cut from the center, which is what the resizer on this page does. This is computed from the shapes.
| Photo shape | Share of the photo kept | What is cut |
|---|---|---|
| 16:9 (1920 × 1080) | 45% | The sides |
| 3:2 (3000 × 2000) | 53% | The sides |
| 4:3 (4000 × 3000) | 60% | The sides |
| 1:1 (2000 × 2000) | 80% | The sides |
| 4:5 (1080 × 1350) | 100% | Nothing |
| 9:16 (1080 × 1920) | 70% | The top and bottom |
Computed.
Measured: six pictures through the resizer
The resizer on this page was run in headless Chromium on six test pictures (public domain NASA scans, a PNG graphic and two small pictures made from them): each is scaled to cover 1080 × 1350, drawn on a white background and saved as a JPG at quality 0.92. SSIM compares each result with a Lanczos crop of the same picture made by ffmpeg (1.0 would be identical); it is blank when the frame has an odd side, which ffmpeg's check cannot compare. Other browsers use their own encoders, so sizes can differ.
| Picture | Pixels | Scale | Result | Time | SSIM |
|---|---|---|---|---|---|
| Photo, nearly square | 3840 × 3877 | 0.35× | 444 KB | 22 ms | 0.92 |
| Portrait | 2122 × 2644 | 0.51× | 306 KB | 20 ms | 0.93 |
| Wide document scan | 3827 × 1588 | 0.85× | 379 KB | 21 ms | 0.93 |
| Square PNG graphic | 5380 × 5432 | 0.25× | 326 KB | 42 ms | 0.90 |
| Small portrait (1060 px) | 1060 × 1320 | 1.02× (enlarged) | 252 KB | 20 ms | 0.97 |
| Small landscape (640 px) | 640 × 480 | 2.81× (enlarged) | 229 KB | 26 ms | 0.97 |
A scale above 1 enlarges the picture to fill the frame; enlarging adds no detail, so start from a file at least as large as the frame.
Detail decides the file size (measured)
The same frame holds 1.46 megapixels whatever the picture, but the JPG size follows the detail in it. Bits per pixel is the file size in bits divided by the number of pixels in the frame.
| Picture | Result | Bits per pixel |
|---|---|---|
| Photo, nearly square | 444 KB | 2.44 |
| Portrait | 306 KB | 1.68 |
| Wide document scan | 379 KB | 2.08 |
| Square PNG graphic | 326 KB | 1.79 |
| Small portrait (1060 px) | 252 KB | 1.38 |
| Small landscape (640 px) | 229 KB | 1.26 |
Smooth areas and flat color compress to a fraction of what fine detail needs; a photograph full of texture is the expensive case. If a size limit matters, check your own picture, not an average.
Using the Threads post image size
- Start from a file at least 1080 × 1350 pixels so nothing is enlarged.
- Keep faces, logos and text away from the edges; every crop above cuts the edges.
- Check the platform's own page before you rely on a figure; sizes change.
- The resizer above does the crop and the JPG in your browser; nothing is uploaded.
Frequently asked questions
What size is a Threads post image?
We use 1080 × 1350 px (4:5). No official fixed size was found.
How much of a 16:9 photo is kept in 1080 × 1350?
45% of its area (computed).
What is the aspect ratio of 1080 × 1350?
4:5, 1.46 megapixels.
How big will the file be?
Our six test pictures came out between 229 KB and 444 KB as JPGs at quality 0.92; detailed photographs are the large end.
Is my picture uploaded?
No. The resizer runs in your browser.
Other Threads sizes
Sources
- Wikimedia Commons: Buzz salutes the U.S. Flag (NASA, public domain), one of the test pictures (checked 2026-10-10)
- MDN: HTMLCanvasElement.toBlob() (JPEG quality) (checked 2026-10-10)
No official Threads page for a post image size could be read; sources listed are for the method.