# DC Tools
> DC Tools is a free, privacy-first online toolbox at https://dc-tools.cc/
> All processing happens in the browser — files never leave the user's device.
> No sign-up required. No watermarks. No usage limits on most tools.

## About
DC Tools was built by DC, an AI & Automation consultant and product lead at an AI startup in Taiwan. The founding principle is "build what you need" — every tool started from solving a real daily workflow problem. DC Tools serves users who need fast, free, and private file processing online.

Contact: dc@dc-tools.cc
Language: Traditional Chinese (zh-Hant), English

## Image Tools
- [Image Converter](https://dc-tools.cc/img_transfer): Convert between PNG, JPG, GIF, WEBP, BMP formats. Adjust output quality. Browser-based.
- [Image Resize & Crop](https://dc-tools.cc/img_resize): Precisely adjust image dimensions or crop specific areas.
- [Image Compress](https://dc-tools.cc/img_compress): Smart compression algorithm reduces file size while preserving visual quality. Supports JPEG, PNG, WebP.
- [Image EXIF Cleaner](https://dc-tools.cc/img_exif_cleaner): Inspect and remove EXIF metadata (GPS, camera info) from photos for privacy.
- [Image Watermark](https://dc-tools.cc/img_watermark): Add text or logo watermarks to single or batch images.
- [Image Border](https://dc-tools.cc/img_border): Add customizable borders to images.
- [Image Page Number](https://dc-tools.cc/img_page_number): Add page numbers to a series of images.
- [Image Batch Rename](https://dc-tools.cc/img_batch_rename): Bulk rename image files with custom patterns.
- [Image Batch Convert](https://dc-tools.cc/img_batch_convert): Convert multiple images to a target format at once.
- [Image Uniform Size](https://dc-tools.cc/img_uniform_size): Standardize dimensions across multiple images.
- [Image to PDF](https://dc-tools.cc/img_to_pdf): Combine multiple images into a single PDF. Supports A4 and original size layouts.
- [Image Hosting](https://dc-tools.cc/img_host): Upload images, get short URL links for sharing with view statistics.
- [Document Auto Crop](https://dc-tools.cc/img_doc_auto_crop): Automatically detect and crop document edges from photos.
- [Document Manual Perspective](https://dc-tools.cc/img_doc_manual_perspective): Manually correct perspective distortion in document photos.
- [Document B&W Scan](https://dc-tools.cc/img_doc_bw_scan): Convert document photos to clean black-and-white scanned appearance.
- [Document Shadow Removal](https://dc-tools.cc/img_doc_shadow_removal): Remove shadows from document photos.

## PDF Tools
- [PDF Merge & Split](https://dc-tools.cc/pdf_merge): Combine multiple PDFs into one. Drag to reorder, expand to preview and delete individual pages. Lossless.
- [PDF Compress](https://dc-tools.cc/pdf_compress): Reduce PDF file size with selectable quality levels. Text remains copyable.
- [PDF to Image](https://dc-tools.cc/pdf_to_image): Export each PDF page as PNG or JPG. Download individually or as a batch.
- [PDF Extract Pages](https://dc-tools.cc/pdf_extract_pages): Extract specific pages or page ranges into a new PDF.
- [PDF Delete Pages](https://dc-tools.cc/pdf_delete_pages): Remove unwanted pages from a PDF.
- [PDF Reorder](https://dc-tools.cc/pdf_reorder): Rearrange PDF page order by dragging.
- [PDF Split Every N Pages](https://dc-tools.cc/pdf_split_every_n_pages): Split a PDF into multiple files, each containing N pages.
- [PDF Split Odd/Even](https://dc-tools.cc/pdf_split_odd_even): Separate odd and even pages into two PDFs.
- [PDF Grayscale](https://dc-tools.cc/pdf_grayscale): Convert color PDF to grayscale for printing.
- [PDF Page Resize](https://dc-tools.cc/pdf_page_resize): Unify mixed-size PDF pages to A4 or Letter.
- [PDF Crop](https://dc-tools.cc/pdf_crop): Crop PDF page margins.
- [PDF Text Watermark](https://dc-tools.cc/pdf_text_watermark): Add text watermarks across PDF pages.
- [PDF Image Watermark](https://dc-tools.cc/pdf_image_watermark): Add image/logo watermarks to PDF pages.
- [PDF Header & Footer](https://dc-tools.cc/pdf_header_footer_text): Add header and footer text to PDF pages.
- [PDF Insert Blank Pages](https://dc-tools.cc/pdf_insert_blank_pages): Insert blank pages at specified positions.
- [PDF Remove Blank Pages](https://dc-tools.cc/pdf_remove_blank_pages): Automatically detect and remove blank pages.
- [PDF Insert Front Cover](https://dc-tools.cc/pdf_insert_front_cover): Add a cover page to a PDF.
- [PDF Insert Back Cover](https://dc-tools.cc/pdf_insert_back_cover): Add a back cover page to a PDF.
- [PDF Duplex Reorder](https://dc-tools.cc/pdf_duplex_reorder): Reorder pages for duplex printing.
- [PDF Merge Duplex Blank Pages](https://dc-tools.cc/pdf_merge_duplex_blank_pages): Add blank pages for correct duplex printing alignment.
- [PDF Merge Separator Pages](https://dc-tools.cc/pdf_merge_separator_pages): Insert separator pages between merged PDFs.
- [PDF Extract Images](https://dc-tools.cc/pdf_extract_images): Extract all embedded images from a PDF.
- [PDF N-Up Print Layout](https://dc-tools.cc/pdf_nup_print_layout): Arrange multiple pages per sheet for printing.

## Data & CSV/Excel Tools
- [JSON to CSV](https://dc-tools.cc/json_to_csv): Convert JSON to CSV with automatic nested object flattening. Supports files up to 5GB. Output is UTF-8 with BOM for Excel compatibility.
- [JSON Formatter](https://dc-tools.cc/json_format): Validate, format, minify, and copy JSON instantly.
- [CSV/Excel to JSON](https://dc-tools.cc/data_to_json): Convert CSV or Excel files to JSON format.
- [CSV to Excel](https://dc-tools.cc/csv_to_excel): Convert CSV files to Excel (.xlsx) format.
- [CSV Batch to Excel Sheets](https://dc-tools.cc/csv_batch_to_excel_sheets): Combine multiple CSV files into one Excel workbook with multiple sheets.
- [Excel Multi-Sheet to CSV](https://dc-tools.cc/excel_multi_sheet_to_csv): Export each Excel worksheet as a separate CSV file.
- [Excel Worksheet Merge](https://dc-tools.cc/excel_sheet_merge): Merge multiple worksheets from the same workbook into one.
- [Data Merge](https://dc-tools.cc/data_merge): Combine two CSV/Excel files by appending rows.
- [Data Dedup](https://dc-tools.cc/data_dedup): Remove duplicate rows based on selected columns.
- [Data Split](https://dc-tools.cc/csv_excel_split): Split CSV/Excel into multiple files by row count.
- [Column Filter & Reorder](https://dc-tools.cc/csv_excel_columns): Select and reorder columns, export a streamlined file.
- [Case Normalizer](https://dc-tools.cc/data_case): Unify text case (upper/lower/title) in selected columns.
- [Date Format Normalizer](https://dc-tools.cc/data_date): Standardize date formats across selected columns.
- [ROC/Gregorian Date Converter](https://dc-tools.cc/data_roc_gregorian_date): Convert between Taiwan ROC calendar dates and Gregorian dates.
- [Fill Empty Cells](https://dc-tools.cc/csv_excel_fill): Fill blank cells with a fixed value in selected columns.
- [Blank Row Remover](https://dc-tools.cc/csv_excel_blank_row): Remove completely blank rows from data.
- [Blank Column Remover](https://dc-tools.cc/csv_excel_blank_column): Remove completely blank columns from data.
- [Email Format Checker](https://dc-tools.cc/csv_excel_email): Validate email format in selected columns and export error report.
- [Email Mask](https://dc-tools.cc/csv_excel_email_mask): Mask email addresses for privacy (e.g., j***@example.com).
- [Length Checker](https://dc-tools.cc/csv_excel_length): Check field length limits and export rows that exceed them.
- [Allowed Values Checker](https://dc-tools.cc/csv_excel_allowed_values): Validate data against a whitelist of allowed values.
- [TW Business Number Validator](https://dc-tools.cc/csv_excel_tw_business_number): Validate Taiwan Unified Business Numbers (統一編號).
- [TW Mobile Format](https://dc-tools.cc/csv_excel_tw_mobile): Validate and normalize Taiwan mobile phone numbers.
- [Number Cleanup](https://dc-tools.cc/csv_excel_number_cleanup): Clean number formatting (remove commas, currency symbols, etc.).
- [Fullwidth/Halfwidth Converter](https://dc-tools.cc/csv_excel_fullwidth): Convert between fullwidth and halfwidth characters.
- [Invisible Chars Remover](https://dc-tools.cc/csv_excel_invisible_chars): Remove zero-width and invisible Unicode characters from data.
- [Whitespace Normalizer](https://dc-tools.cc/csv_excel_whitespace): Normalize whitespace (trim, collapse multiple spaces).

## Utility & Daily Tools
- [Lottery Draw](https://dc-tools.cc/lottery): Import CSV/Excel participant lists, run animated lottery draws.
- [Temporary Chat Room](https://dc-tools.cc/chat): Create instant chat rooms with shareable short URLs.
- [Live Voting](https://dc-tools.cc/vote): Create polls with QR code sharing, real-time vote tracking.
- [Live Quiz Game](https://dc-tools.cc/quiz): Host real-time quiz competitions with leaderboards.
- [DC Translator](https://dc-tools.cc/dctranslator): Real-time bilingual subtitles and translation.
- [Audio/Video Editor](https://dc-tools.cc/media_edit): Trim, merge, and export MP3/MP4 files in the browser.
- [Form Builder](https://dc-tools.cc/form-builder): Create custom forms and surveys with drag-and-drop.
- [Wish Pool](https://dc-tools.cc/wish-pool): Community wish sharing board.

## Why DC Tools?
1. **Privacy First**: All file processing happens locally in your browser. Files are never uploaded to any server.
2. **No Registration**: Use any tool immediately without creating an account.
3. **No Watermarks**: Output files are clean, with no branding or watermarks added.
4. **Taiwan Localized**: Unique tools for Taiwan users — ROC date conversion, business number validation, mobile format tools.
5. **75+ Free Tools**: Comprehensive coverage of image, PDF, data, and daily productivity needs.
6. **Fast & Modern**: Built with React and modern web APIs for instant processing.