WebCodecs in this tab
The browser demuxes, decodes, and re-encodes on this device with WebCodecs. The file stays in this tab.
Bluesky · Video Compressor · No upload
Compress a video for Bluesky.
Compress a video for Bluesky?
Encoding stays on this device. This page does not set a Bluesky megabyte preset, because the 2024-09-11 post does not publish one. On 2024-09-11, Bluesky’s post “Share video on Bluesky” said each post can contain one video, videos can be up to 60 seconds, and the supported types are .mp4, .mpeg, .webm, and .mov.
Gmail Help: Send attachments with your Gmail message; WhatsApp Help: media and documents; WhatsApp Help: longer videos; Telegram FAQ
Last updated
Encoding stays on this device. This page does not set a Bluesky megabyte preset, because the 2024-09-11 post does not publish one.
100% Local
No Upload
Your video never leaves this device
Privacy clean output
What Bluesky published on 2024-09-11
On 2024-09-11, Bluesky’s post “Share video on Bluesky” said each post can contain one video, videos can be up to 60 seconds, and the supported types are .mp4, .mpeg, .webm, and .mov. The same post said you can upload 25 videos / 10 GB of video per day, and that Bluesky may tweak this limit. It also said you must verify your email before you can upload a video. That post does not state a per-file megabyte cap. On 2026-01-26, Bluesky’s post “What’s Next at Bluesky” said the composer should handle media better and that three-minute videos aren’t enough. That sentence is not a published duration cap and not a per-file megabyte cap. The Bluesky support page, checked on 2026-10-14, does not publish a per-file video megabyte cap either. This page does not fill in a megabyte preset. If you set a size here, it is this site’s encoding target. Bluesky: Share video on Bluesky (2024-09-11). Bluesky: What’s Next at Bluesky (2026-01-26). Bluesky support. Video Compressor.
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Drop an MP4, MOV, or WebM
MKV is accepted when the browser can decode it. Processing stays in this tab.
No preview
Video
— · source stays on this device
Destination target:
Detecting…
Compressing0%
- Elapsed
- 00:00
- Remaining
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- Source duration
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- Bytes written
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- Ratio so far
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- Path
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Compressed locally
- Original
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- Saved
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- Time
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- Speed
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Privacy clean output
Saved directly to the file you chose.
Verify it yourself (F12 Network)
This workflow processes your file in this browser tab. Opening DevTools is optional; it is the simplest way to watch what the page actually requests.
- Press F12 (or ⌥⌘I). Open DevTools, then the Network tab, before you start.
- Start the local job (clean, OCR, compress, merge).
- You can also disconnect the network after the page has loaded its UI. Same-origin engine/WASM/language files may still be cached from an earlier visit.
- Your file bytes are not POSTed to CreatorPrivacyKit for this step. Page HTML, CSS, and same-origin runtime assets still load over the network when they are not cached.
Expected Network activity: this site’s CSS/JS, and — after you run the tool — same-origin WASM, codec, or OCR language data. That is a download of our engine, not an upload of your file.
- Processing location
- This browser tab
- Media upload to our servers
- Not part of this workflow
- Remote analysis of your file
- No
This panel is a product fact, not a live packet sniffer. We do not invent a request counter. Ads, extensions, and your own later clicks can still create network traffic.
How compression runs in this browser, with no upload and no server queue
Decode, scale, and encode happen in this tab. CreatorPrivacyKit does not take the video for a server transcode.
No upload to this site
Frames and audio stay in this tab’s memory and temporary browser storage. There is no compressor upload API. That is a real difference from a converter that needs the whole file first.
Watch the Network panel
Open Developer Tools, switch to Network, and start a compress. The media file is not posted to a CreatorPrivacyKit transcode endpoint. Disconnecting the network is a rough extra check, not a formal audit.
Compare the exported bytes
Compare the download with the input. The page shows the byte change. A megabyte target is the upper size you set.
Local browser versus a cloud converter
Upload converters need the whole file first. This page compresses on this device. That is the upload difference. It is not a claim that nothing can go wrong on this computer.
| What you are comparing | This page (browser, no upload) | Typical upload converter |
|---|---|---|
| File upload | No upload The source stays in this browser. | Full upload The whole file is sent to a remote host. |
| Queue | Starts on this machine. There is no shared transcode line. | Often queued. Free tiers delay or cap jobs. |
| Size plans | No paid file-size plan. You are still limited by this device. | Free tiers often cap megabytes and charge for more. |
| Where the file sits | We do not keep a copy of your video on our servers. | Files commonly sit on the converter’s disks for a while. |
| What still can go wrong | No upload to this site. Malware on this device, a browser bug, or you later uploading the output are still possible. | A server breach, staff access, or a misconfigured bucket can expose the original. |
| Container metadata | Re-encoding writes a new MP4 (H.264) or WebM (VP9/AV1) and drops supported container metadata. Pixel-domain watermarks stay. | Behavior varies. Some keep camera headers or add converter tags. |
Size targets for Discord, email, and chat apps
These figures come from vendor help pages checked in September 2026. Apps change limits. A preset is a target — look at the file you actually get.
Discord
20 MB non-Nitro (FAQ, Aug 2026) · 50 MB Nitro Basic · 1 GB NitroDiscord’s File Attachments FAQ lists 20 MB for non-Nitro chat attachments as of August 2026, with 50 MB on Nitro Basic and 1 GB on Nitro. Discord also says it is testing other caps for some users, so the number in your app wins. The in-tool 19 MB Discord target is a margin under the stated 20 MB, not a send guarantee. Nitro was 500 MB. Server Boost Level 2 is 50 MB and Level 3 is 100 MB, for members of that boosted server only. Discord checks file size before its own compression, including on mobile. Open the Discord compressor or read the 20 MB field note.
Source updated August 2026 · checked September 21, 2026 Official source
Email attachments
Gmail consumer ~25 MB then Drive · Outlook.com and internet accounts 20 MB message size · Exchange default 10 MBGmail Help says consumer accounts typically allow about 25 MB of attachments and then insert a Drive link. Workspace attachment size is set by the administrator. Outlook on Outlook.com and internet accounts uses a 20 MB message size, which includes the attachment and the message. The Exchange default is 10 MB, and an administrator can change it. MIME/Base64 can make the sent size larger than the file on disk. Compress for Gmail or Outlook or read the email attachment note.
Checked September 21, 2026 Official source
WhatsApp Help puts a 64 MB ceiling on videos sent as video. Faster connections may default to 100 MB / 720p. Sending as a document is a separate 2 GB path. Those are upload caps, not a promise WhatsApp will keep your bitrate.
Checked September 21, 2026 Official source
LINE
Chat has no official MB cap · VOOM ended 30 Sep 2026LINE chat still has no official universal video MB cap. LINE VOOM, including Official Account VOOM posts, ended 30 September 2026 (around 11:00 JST) per LINE Help. Account rollout varies, and some Official Account content remains in LINE Home. Historic VOOM posts were 500 MB; that was not a chat limit. Official Account broadcast video is still 200 MB. Chat and broadcast messaging continue. Check the size LINE shows before you send.
Source updated July 2026 · checked September 30, 2026 Official source
Telegram
2 GB free · 4 GB Telegram PremiumTelegram’s FAQ lists 2 GB per file on a free account and 4 GB on Premium. Send-as-file can keep container metadata such as GPS. See the send-as-file metadata note.
Checked October 14, 2026 Official source
Local creator workflows
No upload here — still limited by this deviceFor client reviews and unreleased footage, keep the camera master offline and make a smaller MP4 on this device. Video compression guide · Compress without uploading.
Questions
The 2024-09-11 post does not state a per-file megabyte cap. The 2026-01-26 post says three-minute videos aren’t enough, and that sentence is not a megabyte cap. The support page checked on 2026-10-14 does not publish one either.
No. The duration in that post and the file size are different limits.
No. Encoding stays in this browser.