Free tools
Free tools for scheduling social media
Preview a post, check a caption against every platform, size an image. Each one runs in your browser. No signup.
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Built on the same platform data seenpaid uses to publish.
Social Media Post Preview
See how your caption and images will look on each platform before you post.
Cross-Post Checker
Paste one caption and see where it runs over the limit on each platform.
Social Posting API Checker
Compare what each platform’s posting API supports: auth, token refresh, media and limits.
Social Media Image Sizes
Image, video, profile and header sizes for each platform, with the source for every number.
More social media tools
Tweet Character Counter
Count characters as you type and stay under X’s 280 limit.
Twitter Thread Splitter
Split a long draft into numbered tweets that break between words.
Engagement Rate Calculator
Work out engagement rate from likes, comments, shares and reach.
Post Time Zone Converter
See when a posting time lands in your audience’s time zone.
Post Spam Checker
Free post spam checker. Paste a tweet, LinkedIn or Threads post and see if it reads as spam, engagement bait or a hard sell, scored by TypeSafe’s Jev.
Content & writing
Word & Character Counter
Count words, characters, sentences and reading time as you type.
Text Case Converter
Switch text between UPPERCASE, lowercase, Title Case and Sentence case.
Hashtag Generator
Turn a caption or a few keywords into a list of hashtags.
Bold & Italic Text Generator
Make bold, italic and monospace Unicode text for posts and bios.
Caption Cleaner
Remove double spaces, trailing whitespace and extra blank lines.
URL Slug Generator
Turn a title into a lowercase, hyphenated URL slug.
Lorem Ipsum Generator
Generate placeholder paragraphs for mockups and drafts.
Marketing & attribution
UTM Link Builder
Build a link with UTM source, medium and campaign tags.
Revenue Per Post Calculator
Divide revenue by posts to see what an average post earns.
Conversion Rate Calculator
Turn visitors and conversions into a percentage.
Social Media ROI Calculator
Measure the return on what social media costs you.
Revenue & SaaS metrics
MRR Calculator
Turn customer count and monthly price into MRR.
ARR Calculator
Convert MRR into annual recurring revenue.
Churn Rate Calculator
Measure the share of customers you lose each period.
Customer LTV Calculator
Estimate what one customer is worth over their lifetime.
CAC Calculator
Work out what each new customer costs to acquire.
LTV:CAC Ratio Calculator
Check whether your unit economics hold up.
Break-Even Point Calculator
Find how many units you must sell to cover your costs.
Image & file
HDR Photo Converter
Turn a normal photo into an HDR photo that shows brighter on HDR phones in Instagram and Threads. Free, in your browser.
Image Compressor
Shrink a JPG, PNG or WebP in your browser, with nothing uploaded.
Image Resizer
Resize an image to exact pixel dimensions, in your browser.
Image Format Converter
Convert between PNG, JPG and WebP without uploading.
Social Media Image Cropper
Crop an image to 1:1, 4:5, 9:16 or 16:9 for any platform.
Developer & utility
Small utilities we use ourselves.
- Base64 Encoder / DecoderEncode text to Base64 or decode it back.
- JSON Formatter & ValidatorPretty-print JSON and catch syntax errors.
- Password GeneratorCreate a random password of any length.
- HEX ↔ RGB Color ConverterConvert colors between HEX and RGB with a live swatch.
- Unix Timestamp ConverterConvert between Unix epoch time and a readable date.
seenpaid is a social media scheduler for 21 platforms that your AI agent can drive. These tools came out of building it, and they stay free.