ToolStackTools is a collection of 150+ free web-based utilities. PDF, image, calculator and generator tools run entirely in your browser — your files never leave your device. AI tools work without signup for your first two generations, then use free monthly credits.
Free online PDF tools to convert, merge, split, compress, rotate, and protect PDF files. No installation needed.
Free online calculators for VAT, percentages, loans, mortgages, tips, BMI, and more. Instant results with no signup required.
Free AI writing tools to summarize text, rewrite paragraphs, fix grammar, generate essays, stories, and poems. Get 100 free credits on signup.
Free AI tools for social media: generate captions for Instagram, TikTok, YouTube, Twitter, LinkedIn, and more. Free credits on signup.
Free AI marketing tools: generate ad copy, email campaigns, landing page copy, slogans, press releases, and more.
Free AI business tools: generate resumes, cover letters, business plans, proposals, job descriptions, and more.
Free AI utility tools: translate text, extract keywords, format text, generate quotes, analyze headlines, and more.
Free online generators for random numbers, names, passwords, colors, usernames, and more.
Free online image tools to compress, resize, convert, crop, and rotate images. Browser-based processing for privacy.
Free AI personal tools: generate apology letters, birthday messages, wedding speeches, complaint letters, and more.
Free AI branding tools: generate brand names, taglines, and social media threads for your business.
Turn a PDF back into an editable Word document so you can rewrite a section instead of retyping the whole file.
Stitch several PDFs into one file — cover letter + CV, or scanned pages that arrived one at a time.
Shrink a PDF that's too big to email or upload — usually by compressing the embedded images, not the text.
Turn a stack of phone photos or scans into one PDF — the format receipts, forms and portals actually accept.
Compress images to reduce file size
Remove backgrounds from images
Convert images between formats
Generate QR codes from text or URLs
Generate strong, secure passwords
Work out what to charge with VAT on top, or pull the VAT back out of a gross price — the two calculations freelancers and shoppers actually need.
Solve the three percentage questions people actually get stuck on: X% of Y, what percent X is of Y, and the change from X to Y.
Break the blank page: get an intro, three body paragraphs and a conclusion you can rewrite, keep or throw away.
Utility tools (PDF, image, calculators, generators) are 100% free with no signup. AI writing tools give you 2 free generations per month with no signup, plus 100 bonus credits when you create a free account.
No. Every PDF and image tool runs entirely in your browser. Your files are never uploaded to a server.
No account is needed for the utility tools. Sign up only if you want more free AI writing credits.