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Video & Audio Inspector

Add a video or audio file to see its container, length, resolution, frame rate, codec (H.264, HEVC, VP9, AV1 and others), bitrate and HDR, with a guide to whether it can play on Android and upload to YouTube or X (iPhone and Windows are not judged, because no official table was confirmed). The file is not sent anywhere; only its contents are read in your browser.

On-device・No uploadMobile friendlyWorks offline

Your files and input are processed only inside your browser on this device and are never uploaded to our servers.

Drop video or audio

or

Choose several files to compare them. Files are not sent anywhere; only their contents are read in your browser.Accepts: MP4 / M4V / MOV / WEBM / MKV / MP3 / M4A / WAV / OGG / OPUS / FLACPaste (Ctrl+V) also works
What this cannot do

This inspection only reads the contents. It does not repair files or guarantee playback or upload. We did not judge iPhone, Windows or LINE because we could not confirm an official compatibility table.

Works on a phone (390 px wide). Large files and comparisons are easier on a PC.

How to use

  1. recording.movH.265 4K 2 min

    Add the file

  2. H.265 (HEVC) · MOVH.265: device-dependent

    Read the codec and guide

  3. inspection.jsonnumbers + guide

    Save the result

Add a video and check its playback and upload guide

  1. Drop a video or audio file, or choose one with “Choose file”. “Try the sample” makes a 3-second video in your browser to try.

  2. In “Overview”, check the container, length, size and overall bitrate.

  3. In “Video”, “Audio” and “Subtitles”, check the codec name, profile, resolution, orientation, frame rate and HDR.

  4. In “Playback and upload guide”, see the guide and its basis for Android, YouTube and X (iPhone and Windows are not judged). If a target is not usable, use the links below to convert or compress.

  5. Choose several files to see them side by side. “Copy as JSON” or “Copy as text” saves the result.

What it does

Codec details for video and audio

H.264 shows its profile and level (for example High 4.0). HEVC, VP9 and AV1 show profile, level and bit depth. Audio shows the AAC profile and channel count.

Playback and upload guide with its basis

For built-in playback on Android, and for posting to YouTube and X, the guide cites official tables or published limits. It gives no verdict it cannot back up.

Check whether this browser can read it

Using the browser feature that decodes video, the inspector checks whether this browser can read the video and audio, and says so when it cannot.

HDR and rotation

HDR (PQ and HLG) is detected from the colour transfer, and the orientation (landscape or portrait) is shown after rotation. A portrait phone video shows as portrait.

Compare files and copy the result

A comparison table lists length, size, resolution and codec side by side. Copy the result as JSON or text. Files are never sent.

Use cases

  • Check whether an H.265 (HEVC) video from a phone plays on a PC or an older device
  • Find out from the codec and resolution why an MP4 will not play
  • Check the length and format before uploading to YouTube or X
  • Record the resolution, frame rate and bitrate of a video you deliver
  • Check whether shooting dates or locations remain before sharing

Supported formats

Input

Video: MP4, M4V, MOV, WebM, MKV and othersAudio: MP3, M4A, WAV, Ogg and others (within what the browser reads)

Shown

Container, length, size and overall bitrateInformation for each video, audio and subtitle trackWhether metadata exists (values are not shown)

Capability matrix

FeatureSupportNotes
Container, length, size and overall bitrateSupported—
Codec, resolution and frame rate for each video, audio and subtitle trackSupportedFrame rate and track bitrate are estimates from part of the packets
Profile, level and bit depth for H.264, HEVC, VP9 and AV1PartialCodecs without a reader show only their name
HDR (PQ and HLG) and rotationSupported—
Whether this browser can read the fileSupported—
Whether metadata exists (shooting date, camera, location, title)SupportedValues are not shown
Playback and upload guide (Android, YouTube, X)PartialA guide from official tables and published limits, not a guarantee
iPhone and Windows playbackNot supportedNot judged, because we could not confirm an official compatibility table
LINENot supportedNot judged, because we could not confirm an official compatibility table
Repairing a damaged fileNot supportedThe file is never changed
Playing, converting or compressing the videoNot supportedUse the video converter or the video compression tool
Removing or editing metadataNot supportedUse a metadata editing tool before sharing

Limits & notes

  • The file is not sent; it is read in your browser. Reading does not change the original file.
  • Frame rate and track bitrate are estimates from part of the packets, so they can differ from the average over the whole file.
  • The guide is based on official compatibility tables and published limits. The device, app version and the file’s own settings change the result.
  • X’s 140 seconds is the limit for a standard account; the Premium limit is different. iPhone and Windows are not judged because no official table was confirmed.
  • Works on a phone (390 px wide). Large files and comparisons are easier on a PC.

Privacy & safety

The file is never sent off your device; its contents are read in your browser. The page shows contents (codec, length and so on), and metadata only as present or absent, never the shooting date, camera or location values. A copied result includes the file name.

FAQ

How do I check the codec of a video?
Add the file. The codec names for video and audio (H.264, HEVC, VP9, AV1 and others) and their profile and level are shown. Check the codec rows.
Why will my MP4 not play?
One common cause is that the codec, such as H.265 (HEVC) or AV1, is not supported by the device or OS that plays it. Check the guide for each target, and convert to MP4 (H.264 and AAC) if needed.
Where can I see the resolution and frame rate?
In the video rows. The resolution is the display size after rotation, so a phone video shot upright shows as portrait. The frame rate is an estimate from part of the packets.
Can I tell whether it plays on iPhone?
No. This inspection does not judge iPhone playback, because no official Apple compatibility table was confirmed. Check the codec, such as H.265 (HEVC) or H.264, in the video rows.
Can I see whether shooting dates or locations are stored?
Yes. Only whether they exist is shown, not their values. Remove the metadata from the file before sharing it.
Is the file uploaded?
No. The contents are read entirely in your browser, and the file is never sent off your device.

Video Converter, Rotate and Crop

To change only the container, the picture and sound are copied as they are, so the quality stays the same and it is quick. MP4 and MOV can store the rotation without changing the picture. To make a wide video vertical (9:16), fit it with a blurred background or black bars. Your file is never uploaded.

No upload

Video Compress

To make a video smaller, choose the video and a quality preset (High, Medium or Small). Resolution, frame rate and bitrates can be changed one by one. Compare the size, resolution and playback before and after; the file is never uploaded.

No upload

Audio Converter and Video Audio Extractor

To get just the sound from a video, choose the video and an output format (MP3, M4A, WAV, Opus or FLAC). If the source audio is AAC, M4A is written without re-encoding, so the quality does not change. Your file is never uploaded.

No upload

Video Trim and Join

To keep only part of a video, set the start and end on the timeline and press “Add this part”. Put the parts in any order and save them as one video. Videos of the same format keep their quality.

No upload

Video Target Size

To bring a video close to a set size, choose the video and a target (8, 10, 25, 50 or 100 MB, or a custom size). The bitrate is calculated from the target, and if the result is over, it is lowered and tried again. The file is never uploaded.

No upload

GIF Maker

To make a GIF from part of a video, choose “From video”, set the start and end, pick a frame rate and size, and press “Make the GIF”. To join several images, choose “From images”. You can check the GIF in a preview before you save it.

No upload

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