diff --git a/cmd/convert/arc/arc.go b/cmd/convert/arc/arc.go
index ca4bcd34..b092ead3 100644
--- a/cmd/convert/arc/arc.go
+++ b/cmd/convert/arc/arc.go
@@ -52,7 +52,7 @@ func NewCommand() *cobra.Command {
 	cmd.Flags().IntP(flag.ConcurrentWriters, "C", 1, flag.ConcurrentWritersHelp)
 	cmd.Flags().Int64P(flag.FileSize, "S", 1024*1024*1024, flag.FileSizeHelp)
 	cmd.Flags().BoolP(flag.Compress, "z", false, flag.CompressHelp)
-	cmd.Flags().Bool(flag.CompressionLevel, false, flag.CompressionLevelHelp)
+	cmd.Flags().Int(flag.CompressionLevel, 0, flag.CompressionLevelHelp)
 	cmd.Flags().StringP(flag.FilePrefix, "p", "from_arc_", flag.FilePrefixHelp)
 	cmd.Flags().StringP(flag.WarcDir, "w", ".", flag.WarcDirHelp)
 	cmd.Flags().String(flag.SubdirPattern, "", flag.SubdirPatternHelp)
diff --git a/cmd/convert/nedlib/nedlib.go b/cmd/convert/nedlib/nedlib.go
index 1037c595..c0ede700 100644
--- a/cmd/convert/nedlib/nedlib.go
+++ b/cmd/convert/nedlib/nedlib.go
@@ -50,7 +50,7 @@ func NewCommand() *cobra.Command {
 	cmd.Flags().IntP(flag.ConcurrentWriters, "C", 1, flag.ConcurrentWritersHelp)
 	cmd.Flags().Int64P(flag.FileSize, "S", 1024*1024*1024, flag.FileSizeHelp)
 	cmd.Flags().BoolP(flag.Compress, "z", false, flag.CompressHelp)
-	cmd.Flags().Bool(flag.CompressionLevel, false, flag.CompressionLevelHelp)
+	cmd.Flags().Int(flag.CompressionLevel, 0, flag.CompressionLevelHelp)
 	cmd.Flags().StringP(flag.FilePrefix, "p", "from_nedlib_", flag.FilePrefixHelp)
 	cmd.Flags().StringP(flag.WarcDir, "w", ".", flag.WarcDirHelp)
 	cmd.Flags().String(flag.SubdirPattern, "", flag.SubdirPatternHelp)
diff --git a/cmd/convert/warc/warc.go b/cmd/convert/warc/warc.go
index 73122a3f..713d716c 100644
--- a/cmd/convert/warc/warc.go
+++ b/cmd/convert/warc/warc.go
@@ -54,7 +54,7 @@ This is an experimental feature.`,
 	cmd.Flags().IntP(flag.ConcurrentWriters, "C", 1, flag.ConcurrentWritersHelp)
 	cmd.Flags().Int64P(flag.FileSize, "S", 1024*1024*1024, flag.FileSizeHelp)
 	cmd.Flags().BoolP(flag.Compress, "z", false, flag.CompressHelp)
-	cmd.Flags().Bool(flag.CompressionLevel, false, flag.CompressionLevelHelp)
+	cmd.Flags().Int(flag.CompressionLevel, 0, flag.CompressionLevelHelp)
 	cmd.Flags().StringP(flag.FilePrefix, "p", "", flag.FilePrefixHelp)
 	cmd.Flags().StringP(flag.WarcDir, "w", ".", flag.WarcDirHelp)
 	cmd.Flags().String(flag.SubdirPattern, "", flag.SubdirPatternHelp)
diff --git a/cmd/dedup/dedup.go b/cmd/dedup/dedup.go
index 28eb63de..de92dd51 100644
--- a/cmd/dedup/dedup.go
+++ b/cmd/dedup/dedup.go
@@ -63,7 +63,7 @@ The remaining records are written as is.`,
 	cmd.Flags().IntP(flag.ConcurrentWriters, "C", 16, flag.ConcurrentWritersHelp)
 	cmd.Flags().StringP(flag.FileSize, "S", "1GB", flag.FileSizeHelp)
 	cmd.Flags().BoolP(flag.Compress, "z", false, flag.CompressHelp)
-	cmd.Flags().Bool(flag.CompressionLevel, false, flag.CompressionLevelHelp)
+	cmd.Flags().Int(flag.CompressionLevel, 0, flag.CompressionLevelHelp)
 	cmd.Flags().StringP(flag.FilePrefix, "p", "", flag.FilePrefixHelp)
 	cmd.Flags().StringP(flag.WarcDir, "w", ".", flag.WarcDirHelp)
 	cmd.Flags().String(flag.SubdirPattern, "", flag.SubdirPatternHelp)