File Converters

Browse NexKit file converters for PDF to image, PDF to JPG, image to PDF, JPG/PNG/WebP image format conversion, CSV/Excel conversion, and HTML/Markdown to PDF.

Archive Converter

Extract a ZIP, 7Z, TAR, RAR, or other supported archive and repackage it as a ZIP or TAR.GZ directly in your browser. 7Z can be opened as a source but is not available as an output format. Files are never uploaded to a server.
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Convert JPG to PNG

Convert JPG and JPEG images to PNG locally in your browser for compatibility without uploading your files.
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Convert JPG to WebP

Convert JPG and JPEG images to modern WebP files locally in your browser with adjustable quality.
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Convert PNG to JPG

Convert PNG images to JPG locally in your browser. Transparent pixels are flattened onto a selected JPEG background color before download.
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Convert PNG to WebP

Convert PNG images to modern WebP files locally in your browser with adjustable quality and transparency support.
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Convert WebP to JPG

Convert static WebP images to JPG locally in your browser for compatibility with apps and websites that need JPEG files.
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Convert WebP to PNG

Convert static WebP images to PNG locally in your browser for editors, forms, and PNG-only workflows.
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CSV to Excel

Convert a CSV file into an Excel (.xlsx) spreadsheet directly in your browser. Correctly handles quoted fields containing commas or line breaks. Every cell is written as plain text - numbers and codes with leading zeros are not auto-converted. Your file is never uploaded to a server.
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CSV to JSON

Convert CSV text into JSON directly in your browser, using the first row as column headers. Every value is kept as plain text. Your text is never uploaded to a server.
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Document Converter

Convert a DOCX, ODT, RTF, or TXT document directly in your browser. Paragraph text and headings are preserved; tables, images, lists, and fonts are not. Files are never uploaded to a server.
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eBook Converter

Convert an EPUB, DOCX, ODT, RTF, or TXT file directly in your browser. Paragraph text and headings are preserved; cover images, embedded images, CSS styling, and fonts are not. MOBI is not supported. Files are never uploaded to a server.
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Excel to CSV

Convert an Excel (.xlsx) spreadsheet into CSV text directly in your browser. Only the first worksheet is converted. Your file is never uploaded to a server.
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HTML to PDF

Convert an HTML file into a PDF directly in your browser. The file is rendered in an isolated, script-free sandbox for safety - scripts and interactive content are stripped and never run. Your file is never uploaded to a server.
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Image Converter

Convert JPG, PNG, and WebP images locally in your browser. Preserve transparency when supported, choose a JPEG background, and download files individually or as a ZIP.
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Image to PDF

Convert JPG, PNG, and static WebP images into one multi-page PDF locally in your browser. Reorder images, choose page size, fit, fill, and margin settings, then download one PDF without uploading files.
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JSON to CSV

Convert JSON (an array of objects, or a single object) into CSV text directly in your browser. Uses the union of every object's keys as columns. Your text is never uploaded to a server.
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Markdown to PDF

Convert a Markdown (.md) file into a PDF directly in your browser. Any raw HTML embedded in the Markdown is rendered in an isolated, script-free sandbox for safety - scripts and interactive content are stripped and never run. Your file is never uploaded to a server.
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PDF to Image

Convert selected PDF pages into JPG or PNG images locally in your browser. Choose all pages or a page range, adjust render scale, and download files or a ZIP.
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PDF to JPG

Convert selected PDF pages into JPG images locally in your browser. Choose all pages or a page range, then download individual JPGs or a ZIP without uploading your PDF.
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Current converter workflows

NexKit File Converters groups tools whose primary job is changing one file format into another. The current converter set covers PDF to image, PDF to JPG, image to PDF, a general image converter, focused JPG, PNG, and WebP conversion pages, HEIC to JPG, CSV/Excel/JSON conversion, HTML/Markdown to PDF, archive conversion, document conversion, and eBook conversion.

MOBI conversion is not supported - no viable browser-based library exists for this legacy format.

Privacy and processing

Available converter tools listed here run in the browser and do not upload the selected file or text content to NexKit servers for processing. Each tool page lists its own limits and unsupported formats.

Frequently Asked Questions

Which converter families are available?

The available families are PDF to image, image to PDF, image format conversion between JPG, PNG, and static WebP, HEIC to JPG, CSV/Excel/JSON conversion, and HTML/Markdown to PDF.

Are document and eBook converters available?

HTML to PDF, Markdown to PDF, Document Converter (DOCX, ODT, RTF, TXT), and eBook Converter (EPUB, DOCX, ODT, RTF, TXT) are all available on this page and run in the browser. Word to PDF and PDF to Word are also available, listed on the PDF Tools page rather than here. MOBI conversion is not supported - no viable browser-based library exists.

Are files uploaded for conversion?

Available browser-based converters process supported files locally in your browser. Backend-dependent or planned converter pages remain labeled separately.

Available tools

Archive Converter

Convert JPG to PNG

Convert JPG to WebP

Convert PNG to JPG

Convert PNG to WebP

Convert WebP to JPG

Convert WebP to PNG

CSV to Excel

CSV to JSON

Document Converter

eBook Converter

Excel to CSV

HTML to PDF

Image Converter

Image to PDF

JSON to CSV

Markdown to PDF

PDF to Image

PDF to JPG

Current converter workflows

Privacy and processing

Frequently Asked Questions

Available file converters