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Plaintools

No upload. No account.

A utility shed that stays on your device.

Plaintools runs every converter and generator in the browser. Files, tokens, IBANs, and campaign URLs never leave the tab. Use it when you do not want another paste-bin with a login.

Live tools

SEO

UTM generator

Add source, medium, campaign, term, and content parameters to a URL you already own.

SEO

Slug generator

Turn a title into a lowercase URL slug, with stop words stripped and unicode transliterated.

Dev

JWT decoder

Read a JWT header and payload, with human timestamps and an expired flag. The token stays in the tab.

SEO

JSON-LD generator

Build live JSON-LD for FAQ, HowTo, Article, Product, LocalBusiness, Breadcrumb, and Organization.

Convert

HEIC converter

Convert iPhone HEIC/HEIF photos to JPEG or PNG in the browser.

Dev

Text diff checker

Compare two texts with a live line and word diff. Optional ignore-whitespace.

Checkers

IBAN validator

Check an IBAN checksum and country length. The number never leaves this tab.

Dev

Hash generator

Calculate SHA-256, SHA-384, SHA-512, and SHA-1 checksums for text or local files.

Dev

Timestamp converter

Convert Unix epoch timestamps in seconds or milliseconds to ISO 8601, UTC, and local time.

Dev

CSV to JSON converter

Convert CSV records to a JSON array of objects with header mapping and type detection.

Finance

Pool loan calculator

Calculate swimming pool loan monthly payments, total interest, down payment, and payoff schedule.

Finance

XIRR calculator

Calculate annualized internal rate of return for irregular, dated investments and cash flows.

Build

Roof pitch calculator

Convert roof pitch (X/12), slope angle in degrees, grade %, and rafter line length.

SEO

Open Graph generator

Generate Open Graph and Twitter Card meta tags with live social preview cards.

Dev

Subnet calculator

Calculate IPv4 network address, broadcast, usable range, subnet mask, and host capacity from CIDR.

SEO

Favicon generator

Convert any image into PNG favicons (16×16, 32×32, 48×48), favicon.ico, and Apple touch icons.

SEO

Robots.txt generator

Generate RFC 9309 robots.txt files with allow/disallow paths, bot groups, sitemaps, and crawl delays.

Shipping

Etsy fee calculator

Estimate Etsy listing fees, 6.5% transaction charges, payment processing, and net profit margins.

Dev

CIDR calculator

Calculate IPv4 CIDR blocks, network address, broadcast address, netmask, usable hosts, and wildcard mask.

SEO

Schema checker

Validate Schema.org JSON-LD syntax, @context, @type, and required fields for FAQ, HowTo, Article, and Product.

Convert

Image compressor

Compress JPEG, PNG, and WebP images with adjustable quality, scaling, and live file size preview.

Finance

Break even calculator

Calculate how many units you need to sell to cover fixed overhead and reach profit goals.

Convert

GIF compressor

Compress animated and static GIFs in your browser by downscaling dimensions, quantizing colors, and dropping frames.

Text

Case converter

Convert text between lowercase, UPPERCASE, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case.

Text

Readability checker

Calculate Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, and reading time estimates client-side.

Finance

Retirement corpus calculator

Calculate the required retirement corpus, future monthly living expenses adjusted for inflation, and required monthly savings.

Convert

PDF to JPG converter

Convert PDF pages into high-resolution JPG images client-side. Download single pages or a multi-page ZIP.

Convert

Video compressor

Compress and shrink MP4, MOV, and WebM videos client-side using WebAssembly. Files never leave your device.

Finance

GST calculator

Calculate Indian Goods and Services Tax (GST), CGST, SGST, IGST, and net/gross invoice values client-side.

SEO

Hreflang generator

Generate HTML link tags, XML sitemap snippets, and HTTP headers for multilingual and multi-regional hreflang SEO.

Convert

Picture to text converter

Extract text from images using optical character recognition (OCR) client-side with Tesseract.js. Files never leave your device.

Finance

EMI calculator

Calculate loan EMI, interest payments, and view full amortization schedule with CSV export. Runs client-side.

Convert

Audio converter

Convert audio files to MP3, WAV, AAC, OGG, and FLAC client-side using WebAssembly. Files never leave your device.

Convert

PDF to PNG converter

Convert PDF pages into high-resolution, lossless PNG images client-side. Download single pages or a multi-page ZIP.

Text

Morse code to text

Bidirectional text and Morse code encoder and decoder with live audio playback and WPM speed control. Nothing is uploaded.

Convert

WebP converter

Convert PNG, JPG, and GIF images to WebP, or convert WebP to PNG/JPG in your browser using canvas. Files never leave your device.

SEO

Meta tag generator

Generate HTML title, meta description, canonical, robots, viewport, and theme-color tags with live Google SERP preview. Nothing is uploaded.

Checkers

Sort code checker

Validate UK 6-digit sort code formatting (12-34-56 or 123456) and identify clearing banks locally. Format check only; no live bank verify.

Text

Word counter

Count words, characters (with and without spaces), sentences, paragraphs, reading time, and keyword density live as you type.

Dev

Password generator

Generate strong, cryptographically secure random passwords with customizable length and character sets client-side.

Shipping

Dimensional weight calculator

Calculate dimensional (DIM) and volumetric package weight, compare actual versus billable weight, and check standard divisors for FedEx, UPS, USPS, and DHL.

Shipping

UK parcel size checker

Check parcel dimensions and weight against UK carrier and Royal Mail bands (Letter, Large Letter, Small Parcel, Medium Parcel).

Dev

UUID generator

Generate RFC 4122 compliant UUID v4 (random) and UUID v1 (timestamp-based) identifiers with bulk generation and formatting options.

Convert

PNG to JPG converter

Convert PNG images to JPG/JPEG in your browser using canvas. Quality slider, background color for transparency, zero server upload.

Convert

JPG to PNG converter

Convert JPG and JPEG images to lossless PNG in your browser using canvas. Client-side, privacy-first, no uploads.

Checkers

ISBN validator

Validate ISBN-10 and ISBN-13 book numbers, verify modulo checksums, identify publisher country/group, and convert between formats in your browser.

Dev

Base64 encode & decode

Encode and decode Base64 strings and files entirely in your browser. Supports full UTF-8 Unicode, URL-safe Base64, line wrapping, and data URLs.

SEO

XML sitemap generator

Generate clean, valid XML sitemaps compliant with Sitemaps.org 0.9 from a plain text list of URLs. Zero crawls, client-side.

Finance

NPV calculator

Calculate Net Present Value (NPV), Profitability Index, IRR, and discounted payback periods for capital investment projects. Free browser DCF solver.

Shipping

CBM calculator

Calculate cubic metres (CBM) and cubic feet (CFT) for cargo consignments, estimate 20ft/40ft ocean container loading, and compare freight weights.

Convert

FLAC to MP3 converter

Convert lossless FLAC audio files to high-quality MP3 (320k, 256k, 192k) client-side using WebAssembly FFmpeg. Zero file uploads.

Shipping

Vinted fee calculator

UK Vinted payout, buyer protection fee band, and profit after sourcing, packaging, and optional bumps.

Finance

UK VAT calculator

Add or extract UK VAT at 20%, 5%, or 0% from a net or gross amount.

Guides

Size bands, marketplace fees, and tax splits written out. Same formulas as the tools. All guides.

Coming next

  • AVIF converter

    Same privacy model as HEIC: decode in the tab, download a JPG or PNG. Not shipped yet.

  • eBay UK fee calculator

    Insertion and final-value fees for a UK seller account, next to the Etsy and Vinted estimators. Not shipped yet.

  • robots.txt checker

    Paste a robots file and a path; see which rules match. Parsing only, no crawl.

Browse by job: SEO · Dev · Text · Convert · Checkers · Finance · Build · Shipping.