NextGenToolkit — Free Online PDF, Image, Text and Developer Tools

Text Tools

Edit, convert, sanitize AI watermarks, and analyze text & N-gram SEO density locally.

Semantic Topics: N-gram keyword density · SERP pixel width meter · zero-width AI watermark remover · Unicode NFD URL slug generator · O(N) Set line deduplication · HTML to Markdown converter

• Word Counter & SEO Density — Count words, characters, paragraphs, SERP pixel width, and N-gram keyword density.
• Text to TXT & AI Watermark Cleaner — Strip hidden ChatGPT/LLM zero-width watermarks and export clean .txt or .md files.
• Case Converter & SEO Slug Maker — Convert between 12 text cases (camelCase, snake_case, Title Case) and generate bulk SEO slugs.
• Duplicate Line & List Cleaner — Remove duplicate lines, trim whitespace, add prefixes/suffixes, and sort lists in milliseconds.

Image Tools

Compress images to exact KB limits, batch convert WebP, scrub EXIF GPS data, resize for social media, and run OCR.

Semantic Topics: compress image to 20KB 50KB 100KB · bulk PNG JPG to WebP converter · EXIF APP1 GPS coordinate scrubber · multi-canvas social media resizer · browser clipboard OCR Ctrl+V · Core Web Vitals LCP image optimization

• Image Compressor (Target-KB) — Reduce image file size to exact 20KB, 50KB, or 100KB limits without losing quality.
• Bulk WebP & Format Converter — Convert JPG, PNG and WebP images with batch export.
• EXIF & GPS Privacy Scrubber — View and remove hidden camera, shutter, and GPS location metadata (EXIF).
• Social & E-Com Bulk Resizer — Resize images to YouTube, Instagram, LinkedIn, Amazon, and Favicon presets in 1 click.
• Browser OCR (Image to Text) — Extract selectable text from images and pasted screenshots (Ctrl+V).

PDF Tools

Merge, split, compress to exact KB targets, rasterize at 600 DPI, and scrub PDF XMP metadata in your browser.

Semantic Topics: offline PDF compressor 100KB 200KB · client-side PDF merger & organizer · PDF page range splitter · PDF to 300 DPI / 600 DPI PNG WebP · JPG PNG WebP to A4 PDF builder · PDF Info dictionary & XMP sanitizer

• Offline PDF Compressor — Reduce PDF file size to exact KB targets without losing quality.
• PDF Merger & Page Organizer — Combine multiple PDF files into one document offline.
• PDF Splitter & Extractor — Extract specific page ranges or split PDFs into individual files.
• PDF to High-Res Images — Render PDF pages to crisp PNG, JPG, or WebP at 150, 300, or 600 DPI.
• Images to PDF Studio — Convert JPG, PNG, and WebP photos into A4 or Letter PDF documents.
• PDF Metadata & Sanitizer — Inspect and strip hidden Author, Creator, Producer, and XMP tracking tags.

Developer Tools

Format & auto-repair broken JSON, calculate LLM tokens, test Regex ASTs, decode JWT claims, and run Myers code diffs.

Semantic Topics: JSON syntax auto-repair & CSV/TS converter · BPE LLM token & API cost calculator · ECMAScript Regex AST explainer · RFC 7519 JWT payload & exp decoder · Myers O(ND) unified diff & Git patch · UTF-8 TextEncoder Base64 & URL codec

• JSON Formatter & Auto-Fixer — Format, validate, auto-fix broken JSON, and convert to CSV, YAML, TS & SQL.
• LLM Token Counter & Context Packer — Count tokens and API cost across Gemini, GPT-4o & Claude + pack multi-file prompts.
• Live Regex Tester & AST Library — Test regular expressions in real time with capture groups and plain-English AST breakdown.
• JWT Decoder & Inspector — Decode JSON Web Tokens (Header & Payload) with live expiration countdown.
• Code & Text Diff Checker — Compare two code or text blocks using Myers diff algorithm with .patch export.
• Base64, URL & Entity Codec — UTF-8 safe Base64, URL percent-encoding, and HTML entity encoder/decoder.

Calculators & Generators

Generate non-expiring vector SVG QR codes, CSPRNG passwords & 256-bit API keys, epoch timestamps, and POSIX cron schedules.

Semantic Topics: ISO/IEC 18004 vector SVG QR code studio · Web Crypto CSPRNG password & JWT key gen · Shannon entropy & GPU crack-time math · Unix epoch seconds milliseconds nanoseconds · IANA multi-timezone comparison grid · POSIX 5-field crontab schedule evaluator

• Custom SVG/PNG QR Code Studio — Create permanent, non-expiring vector SVG & high-res PNG QR codes for URL, Wi-Fi, and vCard.
• Crypto Password & API Key Gen — Generate CSPRNG passwords, BIP39 passphrases, UUID v4, and 256-bit JWT secrets with entropy math.
• Epoch & Timezone Converter — Convert 10-digit (s), 13-digit (ms), and 19-digit (ns) Unix timestamps across global timezones.
• Cron Expression Studio — Translate 5-field cron schedules into plain English and preview the next 10 execution dates.

Popular Search Intents & Semantic Workflows