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LINE Profile Picture

640×640 PNG · square

Each social platform crops uploaded media to its own aspect ratio before showing it in feeds. Uploading at the platform's native size — here, LINE feed posts — preserves the framing you intended and avoids the soft-focus that comes from the platform's own resampler. This preset outputs 640×640 PNG at the square ratio that LINE expects.

Specifications

Output dimensions	640×640 pixels
Aspect ratio	1:1 (square)
Output format	PNG
Processing	100% in your browser — no upload
Cost	Free, unlimited
Source	Official guidelines

When you'd run LINE Profile Picture

Posting to LINE from a desktop without using the mobile app's built-in compressor.
Re-using a higher-resolution master from a campaign and sizing it specifically for the LINE feed.
Repackaging a screenshot, infographic, or document image to fit LINE's native aspect ratio without the platform's auto-crop.
Scheduling a post via a third-party publishing tool that demands the platform-native size up front.

About LINE and this preset

Audience: 190+ million users, dominant in Japan / Taiwan / Thailand.

How LINE ranks images: messaging-only; profile photo visible to all chats and on the timeline. Posting at the platform's exact native dimensions (640×640 px) preserves your original framing and avoids the softening that happens when the platform's own resampler runs to fit its expected size.

Platform-specific note: LINE caches profile images per-device; the new image takes 1-2 days to fully propagate to all your contacts' caches.

Recent updates (2023-2025): LINE rolled out the LINE NEXT verification badge in 2024 for businesses and creators; profile cover stories (Stories-style 24-hour clips) launched the same year. The platform's Stamp shop integration (paid emoji packs) drives a substantial share of profile-update traffic when users purchase seasonal stamps.

How LINE Profile Picture runs

This preset is a deterministic recipe — every step has fixed parameters so the result is byte-identical across runs of the same input.

Crop the image to a 1:1 aspect ratio. Mochi keeps the centre of the frame in the middle of the crop by default — drag the crop box if you want to recompose.
Resize to 640×640 px as PNG.

Where the work happens

LINE Profile Picture crops your input to 1:1 and resizes it to 640×640 px as PNG — a 409-kilopixel output. The work runs through canvas APIs and a WebAssembly image-encoder; the source image is decoded into an off-screen canvas, transformed in place, and re-encoded without any network upload.

Social-platform uploads frequently re-encode the file at the platform's CDN; running this preset locally before upload lets you see the exact pre-upload state. The browser-side path also means the file never leaves your device — relevant when the input contains personally identifiable information, screenshots of private documents, ID scans, or proprietary product photography.

Common mistakes

Uploading at the wrong ratio. LINE Profile Picture crops to square (1:1) — letting the platform auto-crop a different ratio risks cutting off heads, logos, or captions positioned near the edge.
Uploading at a smaller pixel size than 640×640. The platform upscales to fit, which softens edges and crushes thin text. This preset hits the platform's exact native pixel count.
Compressing twice. If you save the source as JPEG, then re-save after this preset, you'll see compression artefacts. Run this preset on the original PNG/HEIC/RAW where possible.
Uploading sensitive images to a server-side tool. This preset runs entirely in your browser; the file never leaves your device. Verify this in your browser's network panel if working with confidential material.

FAQ

What does LINE Profile Picture output?

640×640 px, saved as PNG.

Why is the output square (1:1)?

The social this preset targets uses 1:1 framing. For passport photos this matches the printed-photo standard; for social posts it's the safe ratio that fills the feed without horizontal cropping.

Why PNG and not JPEG?

PNG preserves hard edges and transparency that JPEG would smear. Icons, logos, and screenshots compress better as PNG when the image isn't photographic.

Does my image get uploaded?

No. This preset runs entirely in your browser using WebAssembly + canvas APIs — no server round-trip. You can verify this in your browser's network panel: only static asset requests, no image upload. The file never leaves your device.

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