Social Media Post Specs Checker

Give the file a destination before judging the export

A file is not simply the right size for social media. It is a particular image or clip intended for a particular placement. A wide demonstration, a portrait product graphic and a square comparison can all be useful, but they ask different things of a layout. Start by naming the destination and format, then compare the export with a reference that describes that job.

This Social Media Post Specs Checker brings those decisions into one local review. Choose Instagram, TikTok, YouTube, Facebook, LinkedIn, Threads, X (Twitter), Snapchat or Reddit. Select a format, read a compatible local file or enter its measurements, and inspect what the selected reference actually checks. You can then save a concise checklist without connecting a social account.

The distinction matters: a preparation target helps a team make consistent derivatives, while a published technical specification describes a boundary within a stated upload route. A file can differ from the chosen canvas without being an invalid upload. The tool keeps that difference visible instead of treating every mismatch as a rejection.

Understand the two kinds of reference in the result

A target such as a portrait canvas is often a design choice. It can leave room for a useful opening, readable product detail and a consistent sequence of images. In this tool, editorial choices are labelled Preparation target. They are not presented as mandatory dimensions issued by a platform. An official recommendation is labelled separately when the source supports that description.

Published technical checks appear only when there is a verified numeric statement for the selected context. Some records include duration, file size or geometry checks. Others provide a canvas comparison without imposing an unverified numeric cap. An empty list of hard checks does not mean the platform has no requirements. It means this record is not claiming a number it cannot support.

Read the scope beside the reference. Native posting, advertising, API publishing and paid-account features are not interchangeable. A large allowance documented for one service tier should not silently become the default for another. The useful outcome is a clear review of the selected case, with any unmeasured or unverified items still visible.

Read local metadata or work from your own measurements

When you choose a supported raster image or video, the browser reads its local metadata. Dimensions come from the media the browser can decode, file size comes from the file itself, and video duration comes from the readable clip metadata. The file is not uploaded by this tool. The local preview is there to help identify the asset you meant to review.

Manual entry is useful when the file is not on this device, a colleague has supplied measurements, or the browser cannot decode its container and codec combination. Enter the actual exported width and height rather than the dimensions of an editing timeline. Add duration in seconds and file size in decimal MB when you know them. A missing optional measurement stays missing, not zero.

The result identifies manual measurements separately from a local file read. If you edit a measured value, the old file preview is cleared and the review becomes manual. That avoids showing an unchanged image beside edited dimensions as though the file itself had been transformed. Keep the export open in your editor if you need to make an actual change.

Pixels describe the canvas; ratio describes its shape

Width and height tell you how many pixels the exported canvas contains. Aspect ratio describes the relationship between those two numbers. A 540 by 960 image and a 1080 by 1920 image share a 9:16 shape, but the larger image contains four times as many pixels. They can fit the same layout shape without carrying the same amount of source detail.

The checker reduces whole-pixel dimensions to an exact ratio and compares that shape with the selected target. A same-ratio result is different from an exact-canvas result. It can tell you that a smaller derivative preserves the shape while still being below your team’s chosen preparation size. That is useful information, not automatic evidence that the platform will reject it.

Be careful with enlarging a small source just to make the numbers match. Upscaling can create a larger file without recovering a blurred label or a cropped product edge. The aspect ratio and resolution guide explains the geometry in more depth. Use it when a team keeps confusing a shape requirement with a pixel-count decision.

Use duration and file size as separate checks

A short clip is not necessarily a small file. Resolution, frame rate, compression and the content itself can change the number of bytes needed to store the video. Likewise, lowering file size does not automatically change the duration or the shape. Treat these measurements as separate controls when deciding what to adjust in an export.

Duration is entered in seconds. A clip lasting two minutes and thirty seconds is 150 seconds, not 2.30. File size in this checker uses decimal megabytes: one MB is one million bytes. A local read uses the actual byte count and expresses it in that unit. If source documentation uses an unspecified MB convention, leave practical headroom near the boundary rather than treating a rounded display as an exact promise.

Do not enter zero to mean unknown. A zero-second duration or zero-byte file is not a complete media export. Leave the optional field blank when you do not have the measurement, and the relevant check will show that the value was not supplied. This is more useful than a reassuring pass based on a missing denominator.

A worked comparison: one clip, two different destinations

Imagine a landscape product demonstration exported at 1920 by 1080 pixels, lasting 150 seconds and occupying 24 MB. In the standard-account X web-video reference, the documented duration boundary is 140 seconds. This export therefore needs review for that specific checked item. Its length is not repaired by changing the pixel dimensions or making the file more compressed.

Now select YouTube Shorts while keeping those measurements. The duration is within the checked three-minute reference, but the wide canvas is not square or taller. That is a different issue. If a Shorts derivative makes sense, recompose the video for the selected shape and check the new file. Simply selecting another platform in a tool does not transform the original export.

A 1080 by 1920 derivative lasting the same 150 seconds would satisfy those checked Shorts shape and duration values. That still does not validate its audio, codec, frame rate, content quality or final classification. The example shows why a useful preparation review names the issue precisely rather than returning a single unexplained green score.

Choose crop, padding or redesign for a reason

When the observed ratio differs from the target, decide which information must survive the change. Cropping can make the subject fill a new frame, but it may remove a hand movement, a comparison label or an important part of a screenshot. Padding retains the whole source, but the content may become too small to read at the destination.

Redesign is sometimes the better answer. A wide chart can become two simpler portrait frames. A horizontal tutorial can use a tighter shot and a separate title area. A dense screenshot may work better as a focused excerpt with one short explanation. Those are editorial decisions about the message, not just arithmetic operations on the file.

The checker does not crop, stretch or re-encode your media. Use the Image Resizer & Carousel Splitter when you want to prepare a still-image derivative, then inspect the exported version here. Keep the original separately so a later platform or layout change does not force you to work from an already reduced copy.

Inspect the visible frame as well as the measurements

A technically plausible canvas can still hide the useful part of the message. Look at where the product, speaker, caption and call to action sit. Check whether text remains readable at a small viewing size, whether the opening makes sense without an explanation, and whether the final frame gives people enough time to understand the next step.

Use the source-preview mode to identify the local file, and the canvas-comparison mode to understand the geometric difference. Neither mode recreates every interface element of a native app. The Video Safe Zone Checker is the separate tool for a more focused overlay and framing review, using an actual frame and adjustable margins.

For a sequence of stills, inspect continuity across the set rather than assuming one correct file validates the whole sequence. A title that moves between frames, a chart with changing scale or a product detail that disappears can interrupt the story. Review each derivative on its own, then view the sequence in its intended order.

Keep text and media requirements in the right place

The pixel dimensions of an image do not describe the length of the accompanying post. A video attachment, a caption, an alt-text field and a long-text attachment can each have different behaviour. This media checker intentionally focuses on dimensions, ratio, duration and file size. It does not apply a text limit to a binary file or count words as pixels.

Use the Social Media Character Counter & Post Preview to inspect the written draft separately. Native composers may count particular elements, including links and Unicode characters, differently. Keep the final text review in the actual destination rather than assuming that a media-size result approves the entire post.

The same separation helps a team divide review work. One person can confirm the delivery asset and version, another can approve the message, and the publisher can inspect the native draft. A short handoff that names all three checks is clearer than one vague status saying that the content has been checked.

Browser readability is useful evidence, not a codec audit

A file extension identifies a container convention, not every detail inside it. Two files with the same extension can use different video or audio codecs. The browser may read one and fail to decode the other. That local failure does not prove the platform will reject it, just as a successful browser preview does not prove the platform will process every feature correctly.

This tool does not infer frame rate, inspect an audio stream or perform a full codec analysis from a filename. It also does not connect to an account to test the available upload route. When a browser read fails, use trustworthy measurements from the export settings or a media inspector and keep the result identified as manual.

For local resource management, the tool limits preview imports to 20 MB images and 500 MB videos, with a separate image-pixel guard. These are browser-tool resource guards, not platform limits. A larger file can still be reviewed with manual measurements. Do not compress a delivery asset unnecessarily just to satisfy a local preview guard.

Save a handoff that someone else can reproduce

Copy results gives you a compact review for a project note. CSV preserves the observed values, reference, status and source context in a checklist. The PDF brings the measurements, canvas comparison and interpretation together, with a link back to this exact tool. None of the exports embeds the uploaded media itself or creates a stored file library.

Keep your own export filename, version and destination beside the report. The report omits the local filename from its generated content, so add an identifier in your project system when the handoff needs one. Recheck the measurements after a revision rather than attaching a report from an earlier file to a later export.

The social media export checklist goes further into that final review. It is especially helpful when a creator, editor and publisher each handle a different part of the work. A reproducible brief reduces repeated questions without pretending that a single automated check can judge every creative decision.

Use each platform guide for the right preparation question

The platform guides below use different situations, not one paragraph with a network name swapped in. YouTube needs a clear distinction between Shorts and a landscape video. LinkedIn often needs legible business evidence and the correct organic upload scope. X needs a standard-account reference kept separate from paid-plan allowances. Snapchat and Reddit involve different media handoffs and viewing contexts.

Instagram, TikTok, Facebook and Threads also need the intended placement named before the export is judged. A familiar canvas can be a useful team convention without becoming a universal official rule. The reference date identifies the snapshot used for the review; it is not a live query of your account. Revisit the relevant native help and composer when a destination changes materially.

Use the guide that matches the work you are preparing, then return to the checker with the actual export. The free tools directory connects this review with writing, measurement and planning tools. Choosing the right next step is more useful than collecting several reports about the same unfinished draft.

Connect a prepared asset with a repeatable account routine

File preparation and account operations are related, but they are not the same job. A correctly prepared asset still needs a clear purpose, the right account and a sensible workflow. Once the export is settled, keep the delivery brief with the content plan so the person running the account does not have to reconstruct what the editor intended.

SMTasker supports account workflows across nine social platforms through connected Android phones and a Windows or macOS client. The available tools differ by platform. This free checker does not upload files into SMTasker, and it does not imply that every supported platform has a Publish feature. Use the relevant platform page to review the capabilities you actually need.

Skye, the AI manager inside SMTasker, and external AI through MCP can help with supported application context and actions. They do not automatically gain access to a file selected in this separate browser tool. The five-day free trial is a practical way to test the account-management side after you have a clear preparation and delivery routine.