Free tools
Free social media tools
Small utilities we built for our own team and opened up to everyone: check caption limits, confirm a video will upload, work out your engagement rate, and pick a posting time that fits your audience.
Last updated: 2026-10-25
Every tool below runs in your browser and covers the 8 networks Postify publishes to: Instagram, Facebook, Threads, LinkedIn, X (Twitter), TikTok, YouTube, and Pinterest. No signup, no credit card, no watermarks on anything you produce.
Free
Character counterCheck caption and character limits for every network as you type.Open tool →Free
Video size checkerCheck video and image size limits before you post, no upload required.Open tool →Free
Engagement rate calculatorCalculate your engagement rate and see how you compare to your niche.Open tool →Free
Creator rate calculatorEstimate what one sponsored post is worth from your follower count and your engagement rate.Open tool →Free
Best time to postFind the best posting times for your audience and time zone.Open tool →Free
Content calendar generatorGet 30 days of post ideas, one pillar and one format per day, built for your industry and your cadence.Open tool →Free
Thread splitterSplit long text into a numbered thread that fits X or Threads, sentence by sentence.Open tool →Free
Fonts generatorTurn your text into bold, italic, script and 20 more styles you can paste anywhere.Open tool →Free
Caption spacerKeep the line breaks in an Instagram caption instead of watching them collapse.Open tool →Free
Image resizerCrop one photo to every size the networks ask for, from a 1080 x 1350 feed post to a 3840 x 2160 YouTube thumbnail.Open tool →Free
Post previewSee where each network folds your caption, from 50 characters on Pinterest to 477 on Facebook, before you publish it.Open tool →Free
Social media holidaysEvery month of social media holidays with hashtags, free to read in full. The email is only the shortcut: all twelve months in one message.Open tool →Free
ROAS calculatorProject what a month of ad spend returns on Meta, Google, TikTok, LinkedIn or Pinterest, then split the budget 70/20/10.Open tool →Free
Ad character counterCheck ad copy against every field limit on Meta, Google, TikTok, LinkedIn and Pinterest, from a 30 character Google headline to a 3,000 character LinkedIn intro that shows 150.Open tool →Free
Ad metric calculatorsCPM, CPC, CPA, CTR and break-even ROAS. Fill any two fields and the third calculates, with platform benchmarks to compare against.Open tool →Free
QR code generatorTurn any link into a QR code for packaging, posters or a table tent. PNG or vector SVG, built in your browser, no tracking and no expiry.Open tool →Free
Hashtag generatorHashtag sets for 13 industries, sorted into broad, medium and niche bands so you can see which tags you could actually rank in.Open tool →Free
Caption generatorInstagram captions built from a hook, a body and one call to action, written for engagement, sales or growth rather than filled in around a photo.Open tool →Free
Bio generatorInstagram and TikTok bios in three tones, every one already inside the 150 and 80 character ceilings the two networks enforce.Open tool →Free
Video hook generatorOpening lines for Reels, Shorts and TikTok across ten hook patterns, written to be said in the first three seconds before anyone decides to scroll.Open tool →Free
Social media ROI calculatorPrice the hours as well as the subscriptions, set the total against the revenue you can attribute, and see what the channel actually returns each month.Open tool →Free
Social media auditTwelve questions across profile, cadence, engagement and ads readiness, scored out of 100, with the weakest of the four called out.Open tool →Free
Profile image resizerCrop one image to a 2560 x 1440 YouTube banner, an X header, a LinkedIn background, a Facebook cover, a profile picture or a thumbnail, all in your browser.Open tool →Free
Safe zone checkerSee what the interface is likely to cover on a Reel or a Short: one frame of your video with Meta's or Google's published ad safe zone drawn over it.Open tool →Free
Video size and ratio calculatorsEstimate a video's file size from bitrate and length, or reduce any size to its aspect ratio, then check either against the published platform limits.Open tool →Free
Bio character counterCount an Instagram, TikTok or X bio against its 150, 80 or 160 character limit, with emoji counted the way you see them and the overflow marked.Open tool →Tools by platform
Each network has its own limits and rhythms. Jump straight to the version tuned for the platform you are publishing to.
Instagram character counterInstagram video size checkerInstagram Reels size checkerInstagram Story size checkerInstagram engagement rate calculatorInstagram money calculatorBest time to post on InstagramInstagram fonts generatorInstagram caption spacerInstagram image resizerInstagram post previewInstagram hashtag generatorInstagram caption generatorInstagram bio generatorInstagram Reels safe zone checkerInstagram bio character counter
Threads
X (Twitter)
TikTok
YouTube
YouTube character counterYouTube video size checkerYouTube Shorts size checkerYouTube video length checkerYouTube thumbnail size checkerYouTube engagement rate calculatorYouTube money calculatorBest time to post on YouTubeYouTube fonts generatorYouTube thumbnail resizerYouTube description previewYouTube banner resizerYouTube profile picture resizerYouTube and Shorts thumbnail resizerYouTube Shorts safe zone checker
Need the how-to, not the numbers?
Our platform guides walk through connecting an account, composing, and scheduling on each network.
Stop checking limits by hand
Postify supports nine platforms in one workflow: plan, schedule, and publish without juggling five different tools.