135 tools · 17 categories · free to use
PDFs, images and text
sorted in seconds.
Sintools is a free browser toolkit for everyday file work — merging PDFs, resizing images, cleaning up text and formatting code. Open a tool and go; most of them run entirely on your device.
- No install, no sign-up to run a tool
- Works on phone, tablet and desktop
- Files stay on your device where possible
Common tasks
All 135 toolsSearch all 135 tools from the bar above — or press Ctrl K anywhere on the site.
Browse
Pick an area of work
9 areas of work, 17 categories and 135 tools in total. Each page lists every tool it contains.
Start here
Tools that cover the most common jobs
A short list we keep curated: the utilities most people need first.
Tools explorer · 135 tools
Find the right tool, fast
Search across 17 categories — filters, sort and keyword search all work without leaving this page.
PDF Tools
Everyday PDF workflows.
Image
Image Tools
Fast, browser-based image utilities.
Image
OCR Tools
Turn images and scans into editable text.
Text
Text Tools
Clean up, count, and format text instantly.
Developer
Developer Tools
Encoders, formatters, and generators.
Security
Security Tools
Passwords, hashes, and safety checks.
File
File Tools
Work with archives and metadata.
CSS / UI
Design Tools
Copy-paste CSS gradients, shadows, and effects.
Design linear and radial gradients and copy production-ready CSS.
Design layered shadows visually and copy the CSS.
Visually shape each corner of a box and copy the CSS.
Design frosted-glass panels with adjustable blur and opacity.
Productivity
Productivity Tools
Everyday helpers you actually use.
Social Media
Instagram Tools
Captions, hashtags, resizers, and grid tools.
Live count of characters, words and emoji against the 2,200 caption limit.
Fit your bio inside Instagram's 150-character limit.
Validate an Instagram username against the platform's rules.
Generate 30 topical + evergreen hashtags for any niche.
Social Media
YouTube Tools
Thumbnails, tags, timestamps, and revenue tools.
Stay inside YouTube's 100-character title limit.
Combine a clean description with a chapter block, ready to paste.
Build clickable YouTube chapter timestamps.
Build a deduped tag block that fits YouTube's 500-character limit.
Social Media
TikTok Tools
Captions, hashtags, and safe-zone previews.
Count characters against TikTok's 4,000-char caption limit.
Get 20 niche and trending hashtags for TikTok.
Verify your video won't be hidden by TikTok's caption bar or action rail.
Crop any photo to TikTok's 200×200 circular profile picture.
Social Media
Facebook Tools
Covers, profile pictures, and post resizers.
Resize any image into Facebook's 820×312 page cover.
Resize any image into Facebook's 1640×856 group cover.
Prepare a 1920×1005 event cover that looks sharp everywhere.
Crop any photo to Facebook's 320×320 circular profile picture.
Social Media
Twitter Tools
Threads, headers, and card previews for X.
Fit a tweet inside X's 280-character limit with emoji-safe counting.
Chunk a long draft into 280-char tweets, each numbered.
Prepare a 1500×500 profile header for X.
Crop any photo to X's 400×400 circular profile picture.
Social Media
LinkedIn Tools
Banners, headlines, and post counters.
Resize any image into LinkedIn's 1584×396 profile banner.
Crop any photo to LinkedIn's 400×400 circular profile picture.
Fit your LinkedIn headline in 220 characters.
Track LinkedIn's 3,000-character post limit as you type.
Social Media
Pinterest Tools
Pins, boards, and description helpers.
Fit any image into Pinterest's 1000×1500 standard pin.
Stay under Pinterest's 100-character pin title cap.
Fit a pin description inside Pinterest's 500-character limit.
Prep an 800×800 board cover for Pinterest.
Social Media
Messaging Tools
WhatsApp, Telegram, Discord, and Snapchat.
Create a wa.me link with an optional pre-filled message.
Create t.me deep links for profiles, prefilled chats and shares.
Generate <t:…:F> tags Discord auto-localizes per viewer.
Preview bold, italic, spoiler and code Discord markdown.
Recently added
New in Sintools
Tools added in the latest release.
Featured
Editors' picks
Hand-picked tools worth bookmarking.
Guides
How-to articles
Short, tested walkthroughs for the tasks the tools solve.
No articles published yet
The blog is wired up and the first guides are in progress. Meanwhile, every tool is ready to use.
Browse toolsHow Sintools works
Browser-first tools, honest limits
Sintools is a small, independent toolkit. No account is needed to use a tool, and the interface stays out of the way.
Everything in one place
Stop hopping between random single-purpose sites for every small task.
Fast, browser-based
Tools run instantly in your browser — no installs, no waiting.
Privacy-first
Utility tools work locally where possible. Your files stay yours.
Modern interface
A calm, focused workspace with no popups fighting for attention.
FAQ
Questions people actually ask
Short answers about accounts, pricing and where your files go.
What is Sintools?
Sintools is a modern productivity and utility platform — image tools, PDF tools, text tools, developer tools, security tools, and everyday helpers in one clean workspace.
Which tools are available right now?
Every live tool in the tools explorer opens directly. New tools ship regularly across PDF, image, text, developer, security, file, and productivity categories.
Are the tools free to use?
Yes. Sintools utility tools are free to use in your browser. Pro unlocks priority processing, an ad-free experience, and early access as new tools launch.
Do I need an account?
No. Every tool works without an account, and your recently used tools are remembered locally on your device. You only need an account if you upgrade to Pro.
Is my data private?
Yes. Utility tools run locally in your browser wherever possible. Your files aren't sold or used to train third-party models.
What about AI tools?
AI-powered tools like Writer, Summarizer, Paraphraser, and Grammar Checker are on the roadmap and will roll out gradually in future updates.
Pricing
Free for everyday use
Pro is optional. It covers priority processing and the extras — cancel any time from your billing page.
Free
Everything you need for everyday files
$0forever
- Every live tool, no sign-up required
- Browser-side processing where supported
- Standard processing speed
- Supported by ads
Pro
For regular useFor heavier, repeated use
$12/ month
- Unlimited usage on AI tools
- Priority processing
- History across devices
- Ad-free experience
- Early access to new tools as they launch
Prices in USD. Subscription billing is handled by Paddle; see the refund policy for details.