Check your video before you post it.

01Free

Each app’s safe zones

What it checks

Whether on-screen text falls under the top bar, the buttons on the right, or the area of the app’s username and caption.

How

Each platform has its own zones, measured on a 1080×1920 canvas from published guides. The text read from the image is compared with the core area (“covered”) and with the wider, conservative zone (“may be covered”).

What you gain

You see which word gets lost and in which app, on a phone preview, before your audience does.

02Free

On-screen spelling

What it checks

Mistakes inside subtitles and video text, in 18 languages. Text is read in 19 languages; Finnish has no spelling check.

How

The text is read from the image (OCR) and checked with Hunspell, the same spelling engine LibreOffice and Firefox use. English is built in. The other languages download once and then work offline. Capitalized and ALL-CAPS words are treated as names, and @handles and hashtags are skipped, so they are not flagged.

What you gain

The mistake doesn’t leave with the video. Anything that is correct but missing from the dictionary can be added to your personal dictionary and won’t be flagged again.

03Free

Readability

What it checks

Letters too small for a phone, low contrast against the background, and text that disappears before you can read it.

How

The height of the words is measured against the frame (under 2.2% is hard to read), the contrast between text and background (2.5:1 or more is good) and how many words appear per second (over 3.5 is fast).

What you gain

The text you add reads at a glance on a phone, and viewers don’t have to pause.

04Free

TikTok and CapCut watermarks

What it checks

Whether the name or end card of TikTok or CapCut is visible in the picture.

How

The same OCR looks for the app’s name near the edges of the frame, or in an end card in the last seconds, together with the @handle that comes with it.

What you gain

Instagram and YouTube may show videos with another app’s watermark less often. You find out before you post, not when the reach drops.

05Free

Audio

What it checks

Loudness in LUFS, peaks, and silence at the start.

How

Loudness is measured as integrated loudness according to ITU-R BS.1770. The target is about −14 LUFS (acceptable from −20 to −9) with peaks below −1 dB. This is guidance for social media, not a platform requirement. If there is no audio, or it starts after about a second of silence, you see it.

What you gain

Audio that is neither a whisper nor squashed. Viewers hear it clearly without touching their phone’s volume.

06Free

Technical quality

What it checks

HDR files, odd or variable frame rate, audio that ends before the video, very low bitrate, silent gaps, sudden loudness jumps, flashing, and codecs that get re-encoded anyway.

How

The file’s own details are read without decoding it (with the open-source mediabunny library), and the audio and the sampled frames are measured on your device. Flashing is judged on the sampled frames only, so it is shown as “possible”.

What you gain

You find the problems that only show up after upload, such as washed-out HDR colours or sound that drifts, while you can still re-export.

07Free

Size, aspect ratio, length

What it checks

9:16 aspect ratio, resolution and length, separately for each platform.

How

Minimum resolution 720×1280, recommended 1080×1920, with a small tolerance on the ratio. Length limits: Reels from 3 s to 3 minutes (Instagram does not recommend longer Reels to new audiences), TikTok from 3 s to 60 minutes, Shorts from 1 s to 3 minutes.

What you gain

No black bars, no blurry picture, and no Short that turned into a regular video because it went over three minutes.

08Free

Caption, hashtags and ad disclosure

What it checks

Caption length, number of hashtags, ad disclosure and the AI label.

How

Reels: 2,200 characters and 5 hashtags. TikTok: 4,000 characters. Shorts: a title of 100 characters and 15 hashtags (beyond that YouTube may ignore all of them). If the caption has a discount code, an affiliate link or a brand “collab”, it asks for #ad or #sponsored. If it mentions AI, it reminds you of the platform’s label.

What you gain

Your caption is not cut off and your ad is not left without a disclosure.

In an EU authorities’ sweep (ICPEN, 2024), almost all the influencers examined had posted commercial content, but only about one in five disclosed it consistently. Post Metras is a reminder, not legal advice. See the ICPEN announcement

09Pro

Sponsor deliverables

What it checks

Whether the video meets what the brand asked for: brand name on screen, hashtags, length.

How

You enter the deliverables once: the brand name that must show within the first N seconds, the hashtags that must be in the caption, and the length range. The check compares them with the video.

What you gain

Fewer rounds of corrections with the brand. You have checked the basics before you send the video.

10FreePro

Report as an image

What it checks

The result of the check, ready to send.

How

The report is saved as an image with the results for each app. In the free version it carries a small Post Metras mark. In Pro it carries your own name or brand.

What you gain

You send your client or team proof that the video was checked, without screenshots and explanations.

11Pro

Many videos at once

What it checks

A whole batch of videos in one go.

How

You pick several files. They are checked one after another on your device and you see a list with the result for each. You open only the ones with issues.

What you gain

For editors and agencies: everything you deliver to a client is checked in one pass, not file by file.

12FreePro

Appearance themes

What it checks

How the app looks, for anyone who works in it for hours.

How

Seven themes. Free: Paper, Studio and High contrast. Pro: Charcoal and gold, Champagne, Midnight and Mint. All are checked for text contrast, and High contrast reaches 7:1.

What you gain

Pick dark for the evening or light for the day, and the report reads clearly in both.

13Free

No internet after the first time

What it checks

It opens and works without a connection, like an installed app.

How

The first time, the app and text recognition load and are stored on your device. You install it from the browser (Add to Home Screen, or Install). English is built in, and every other language needs one download.

What you gain

Work on a train, on a plane, or wherever there is no signal. Your video never goes over a network, even when there is one.