Free tools
Free tools for people who post
74 tools, no signup, no watermark. Built on the same code posthell's composer runs, so what you see here is what the networks actually get.
74free tools
15networks covered
19AI generators
0signups required
Link preview checkerYour link, unfurled on six networks before you post itPaste a URL and get the exact card X, LinkedIn, Facebook, Discord, Slack, and WhatsApp will render, plus a tag audit that verifies your og:image actually loads, reads its real pixel size, and hands you the corrected tags. The X card validator that no longer exists, and then some.Check a link →
Thread splitterLong text in, a thread that reads well outNumbered parts that fit X, Threads, or Bluesky, split at paragraphs and sentences instead of mid-thought, with a live preview of the stack.Split a thread →
Post previewPreview the post, download the mockupSix networks rendered pixel-close to the real feed, and any card exports as a crisp PNG for decks, docs, or feedback.Open the preview →
Ship ReceiptYour month of shipping, printed as a receiptType a GitHub username and get the last 30 days of commits, PRs, and releases as a receipt, with a leaderboard rank worth posting.Print my receipt →
AI caption and post generators
8 networksDescribe the post, pick a tone, get three options written for each network's real conventions. Free, a few runs a day, grounded on your topic only.
Google review response generatorNewThree owner replies to any review, with nothing inventedPaste the review, pick the star rating, and get three public replies: warm and specific on the praise, calm and offline-moving on the complaints. It never makes up discounts, policies, or contact details, because future customers read your replies more carefully than your posts.Answer a review →
Bio and headline generators
6 networksFive options per run, each inside the network's real limit: 150 on Instagram, 160 on X, 80 on TikTok, 220 for a LinkedIn headline.
Hook and title generators
4 networksThe first line decides the swipe. Five openers per video idea, honest by instruction: no 'wait for it', no promises the video doesn't keep.
Images and links
Image resizerThe exact pixels each network wantsCover-crop to any network's real dimensions with a movable crop position. All in the browser; the image never uploads.Resize an image →
Grid splitterOne image, sliced for carousels and gridsEdge-matched carousel squares or a 3-wide profile grid at Instagram's native 1080, downloaded in the order you actually post them.Split an image →
Image compressorSame picture, a fraction of the bytesJPEG or WebP out at the quality you pick, dimension caps for social, and exact before-and-after sizes. Nothing leaves your browser.Compress an image →
UTM builderCampaign links your analytics can readSource and medium presets per network, tidy lowercase values, and the finished URL ready to copy. GA4 reports stay clean.Build a link →
Feed plannerNewYour next nine posts, arranged firstDrop upcoming posts into a 3-wide profile grid, drag until it reads right, and get the exact posting order. Images never upload.Plan your grid →
Image sizesNewEvery dimension that matters, one pageThe exact pixels for posts, stories, covers, and thumbnails across 9 networks, each with its aspect ratio and tap-to-copy.Open the cheat sheet →
Calculators and quick utilities
Engagement calculatorNewThe rate, by followers and by reachType a post's numbers (8.4k shorthand works) and get its engagement rate both ways, formulas shown, for any network.Calculate a post →
Script timerNewHow long your script runs out loudSpoken length at three real paces, plus the word budget for 15, 30, 60, and 90 second videos, so the edit starts on paper.Time a script →
Hashtag counterNewTags counted against the real limitsHashtags and mentions counted, duplicates flagged, and the total checked against Instagram's hard 30 and the conventions elsewhere.Count your tags →
Invisible characterNewThe blank character, one tap to copyThe braille blank that keeps empty lines alive, three more variants explained, and a paste tester that proves the copy worked.Copy the character →
Discord timestampsNewOne moment, every member's timezonePick a date and time, copy any of the seven <t:...> codes, each previewed the way Discord will render it.Generate a timestamp →
Case converterNewCaps fixed, links left aloneSentence, title, upper, and lower case for social text, with URLs, hashtags, and mentions passed through untouched.Convert your text →
Character counters
15 networksEvery network's real limit. On X a link counts as 23 characters; on Bluesky emoji count once.
Line breaks that survive posting
8 networksInstagram and friends delete blank lines and collapse breaks. These clean your spacing and carry blank lines with an invisible character.
Bold and italic text
8 networksUnicode styled alphabets for the networks with no formatting button, plus the native syntax where one exists (YouTube comments, WhatsApp).
Post mockup generators
Fake tweet generatorNewThe post that doesn't exist yet, as a PNGA pixel-close X post mockup with your name, text, metrics, avatar, and dark mode, exported crisp for decks, ads, and memes.Build a mockup →
Instagram mockupNewA feed post that never touched the feedUsername, image, caption, likes, and verified badge on an Instagram-accurate card, for client approvals and decks.Mock an IG post →
LinkedIn mockupNewThe ghostwritten post, ready for sign-offName, headline, text, and reaction counts on a LinkedIn-accurate card. The approval artifact agencies screenshot anyway.Mock a LinkedIn post →
Discord mockupNewBot messages, designed before they existUsername, role color, BOT tag, and message on the real dark canvas. For bot devs, server docs, and announcements.Mock a message →
Styled text generators
Fancy textNewAll 19 styles in one boxBold, cursive, outline, bubble, wide, tiny, struck: every Unicode style the engine knows, each one tap to copy.Style some text →
Cursive textNewScript styles for names and biosCursive, bold cursive, and italics that paste into any bio or display name, with the honest accessibility caveats.Write in cursive →
Small textTiny superscript, subscript, small capsUnicode small text for bios and captions, honest about the letters Unicode never encoded instead of faking them.Shrink some text →
StrikethroughCross out text on networks with no buttonSix line styles that paste into X, Instagram, and LinkedIn, with the native syntax noted where one exists.Strike it through →
The free tools are the preview. The scheduler is the product.
posthell runs these same checks live while you write, tailors each version per network, and schedules to all 15 at once. Honest founder pricing, X included at the exact rate.